When mouse hits upple left corner of screen, windows disappear

The upper lefthand corner on my Macbook Pro is hot. When the mouse pointer hits the corner, the active windows on my screen collapse off the desktop. When I hit the same corner again, the windows reappear. Is there a setting in System Preferences which will remove this function? Thanks

Open the Exposé and Spaces pane of System Preferences, click on the Exposé tab, and change the entry in the upper left menu to a dash.
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My Magic Mouse (wireless) paired with my 2010 iMac: Often at startup the cursur just sits in top left corner of screen, frozen. Not a battery problem. New. I take batteries out, reboot (a real pain)... then ok. HELP!

My Magic Mouse (wireless) paired with my 2010 iMac: Often at startup the cursur just sits in top left corner of screen, frozen. Not a battery problem. New. I take batteries out, reboot (a real pain)... then ok. HELP!

Hello:
Try resetting the PRAM and SMC.
Barry

I forgot how to use the setting, move the mouse to the upper left corner and the windows become smaller for an overview?

i forgot how to use the setting, move the mouse to the upper left corner and the windows become smaller for an overview?

I'm not quite sure what you want - if you want an overview of all open windows, use the F key.. Otherwise please post back and be more specific.

Group Chat hidden window blocks mouse clicks in top-left corner of screen

Hey guys, I'm not sure if this is the right place to report Group Chat bugs or not, but we're using Office Communicator Server 2007 R2 Group Chat, Version 3.5.6907.0.
The problem is that Group Chat places a hidden window in the top-left corner of the screen, and intermittently it blocks mouse mouse hovers and clicks. Many people in our office experience this, so it's not just myself. Closing Group Chat fixes
the problem, and when you click Exit on the Group Chat tray icon, you can actually see the "Logging out" window appear where the mouse clicks are being blocked.
Here's a pic showing where the transparent Group Chat box is lying over my Visual Studio app, so I'm unable to click File, Edit, View, or Git. I used UISpy to find and identify
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Another user with the exact issue as described above. After spending a lot of time troubleshooting the problem I have narrowed down the events that produces the 'hidden window'. If GroupChatConsole.exe is running and the user locks and then unlocks
their computer, this problem occurs. This would explain why closing and re-opening Group Chat appears to 'fix' the problem. If the computer is locked and unlocked again though (with Group Chat running), the problem returns. It doesn't matter if
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We have tried all the basic troubleshooting such as uninstall/reinstall, reboot, etc. We even imaged a brand new laptop and migrated the user to the newer model, but problem starting occurring again after a few days.
I love troubleshooting challenging problems, but this is something I have never encountered before... and after tirelessly searching the internet, doesn't seem like many others have, either. I hope someone else can provide some more insight or
clues to permanently fix this problem!
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White shadow in top left corner of screen when unlocking with fingerprint only

White shadow has started showing up in top left corner on the transition from lock screen, then disappears. This is new, and it concerns me that it could be a progressive problem. Is this a hardware or software issue? Am I going to have to take it in?

I have an issue with a white rectangular box appearing in the top left corner of my laptop screen.
Do you have any Modern UI Fullscreen (MUF) apps running then? Sounds like a thumbnail for one that you could dig out of the corner by using your mouse pointer or see the whole MUF bar by pressing Win-Ctrl-Tab. If it is staying around
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Mouse stuck in left corner at login screen

Recently as in this morning i havent been able to log in, the computer starts up and appears ok untill you try to move the mouse which doesnt respond. The text field for your password is highlighted and the cursor is blinking but it doesnt respond at all, you can turn caps on or off or enter text. ive also tried safe mode and repair the disk with disk utility when booting off a os x cd. using an osx cd everything functions perfectly. im currently reinstalling mac os x 10.6 to see if that fixes it but im not sure it will.

Just this morning I had the exact same problem. I just installed Windows 7 on Parallels, and shut down the computer yesterday after it hung. Today I turn on my computer and the mouse is at the top left of the screen, and the cursor is blinking in the password field, but I cannot move the mouse or enter a password.
I have tried to reset the SMC (http://support.apple.com/kb/HT3964), I have restarted with the boot disk and the disk utilities found errors and repaired them, but it didn't help. I saw a solution posted here (http://support.apple.com/kb/HT3964)from Deanoh (post 5) where he suggests resetting the PRAM (1. Restart your computer while holding down the keys CommandOption+PR.
2. Wait for your computer to chime twice before releasing the keys.
The screen will flash when the PRAM resets.)
BUT this did not help.
Deanoh's second suggestion is interesting as before my computer crashed yesterday it was constantly showing an error "could not connect network drive"
I have been trying to find out how to disconnect a network drive without logging onto the computer, because I can't, but haven't found a solution yet.
I have tried restarting in single user mode (press cmd-s at restart) but at the prompt I cannot type anything.
I know my keyboard and mouse work, as I used them to repair the disk using sidk utility when I booted using the Mac OS X cd.
If anyone can come up with any other suggestions I would love to hear them. I really wouldn't want to format my hard disk restore from my time machine backup, it's my last resort, but even then I cannot guarantee it would work, as then backup is up to date and backed up the computer in the current state!
Thanks

Mouse cursor moves to corner of screen

I have an HP wireless keyboard (PN 578571-001) and companion wireless mouse (PM 578572-001).
Recently, the mouse pointer has begun moving frequently to the bottom left corner of the screen and then apparently simulating a left-click to activate whatever icon on my Windows 8 task bar it happens to find itself on. In my case, it is my Windows Explorer, so every few minutes, the Explorer window pops up in my face.
This is VERY annoying, and I've tried a number of tactics, including re-booting, uninstalling all pointer devices and re-booting (to re-initialize the driver settings), turing off various mouse options in the Control Panel. Nothing seems to work.
I've seen from searches in the Internet that other users are experiencing this problem on other HP computers with wireless keyboards and mice. And it seems to be a software problem.
What's even more frustrating is that when I enter the part number for my keyboard or mouse on the HP web site, all that is returned is a list of computers...the keyboard and mouse is NOT shown as the separate product that I purchased.
Does ANYONE know of a sure fix for this problem?

@DrTechnical
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Thank you,
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I Work for HP

How do I get rid of yahoo toolbar and get back my orange firefox button in the upper left corner of screen so I can use my stuff again?

Yahoo toolbar suddenly imposed itself as my log on screen whenever I booted up my computer and clicked on Firefox. Now I can't get to my bookmarks even though it told me that if I activated the new bookmark system it would transfer my old ones. It didn't happen. The toolbar has no bar for typing in a www.http address. I cannot use it and don't want it. I am using Explorer just so I can access my bookmark address, but don't like Explorer. I want my old Firefox screen back that has the little orange button in the upper left corner of the screen. How can I get there? My computer use has been highly curtailed by this unrequested invasion!

Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: command+Shift+F). 
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You can click the Maximize button at the top right to leave full screen mode or right click empty space on a toolbar and use "Exit Full Screen Mode" or press F11. 
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*https://support.mozilla.com/kb/Menu+bar+is+missing
Make sure that toolbars like the "Navigation Toolbar" and the "Bookmarks Toolbar" are visible: "View > Toolbars"
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*http://kb.mozillazine.org/Toolbar_customization
*https://support.mozilla.com/kb/Back+and+forward+or+other+toolbar+items+are+missing

Problem with windows shrinking vertically and becoming stuck in upper-left corner of screen.

Does anyone else have problems with open windows shrinking vertically and becoming "pinned" to the top-left corner of the screen in OSX 10.9? They snap back to the upper-left if I try to move them. I have to Quit or Force Quit the apps and restart them.
I have a Mac Mini, and I have it hooked up to a TV via HDMI. This only seems to happen when I switch the TV input source *from* the Mac Mini to, for example, DirecTV. When I switch the TV's input source *back* to the Mac Mini HDMI connection, all seems fine; except that some or all of the windows that were on the desktop have shrunken vertically, and they are "stuck" in the upper-left corner of the screen. When I try to move the windows out of the upper-left corner, they snap right back. Very weird.
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same here:
Overview: I've seen it occur with the symptoms described by the OP while running Xcode, almost exclusively after waking my laptop from sleep mode. It effects non-Apple apps as well, but sometimes differently-- the window(s) open in Eclipse Juno for instance will sometimes disappear entirely such that they are totally inaccessible. As the OP noted the only way to clear the problem is to force quit the app and restart it (quite a hassle if you have multiple project windows open at once). I run Juno on Win32 and debian Linux also and have never seen behavior like this, so given that the problem has been observed in Apple branded apps and the fact that it only started after I installed Mavericks I would also posit that it is a Mavericks bug. That said, I do run a third-party app called WindowMagnet (v. 1.6 by CrowdCafe) that affects the window system, allowing Windows 7 Aero style window snapping; does anyone else having this problem use WindowMagnet?
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System info: mid 2012 macbook pro (OSX 10.9.1)

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Maybe some of the solutions in here Troubleshooting issues with video can help.
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Stefsn

Help - Duplicate icons in top left corner of screen

Just been using my iPad, and during an app update (a free one from the apps store), my screen suddenly changed, and now the home screen has a pile of icons on top of each other in the top left corner of the screen. These icons are duplicates of the ones on my home screen, and the ones in the original places don't work.
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Three of your apps ended up in a folder that was somehow created on your iPad. That folder was named Productivity by the iPad.
Restart or reset the iPad and see if you can control the apps on the screen afterward.
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* https://support.mozilla.com/kb/Safe+Mode
* [[Troubleshooting extensions and themes]]

When mouse hits upple left corner of screen, windows disappear

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