Yosemite sends me to login screen - while I'm working!

Not every day, but (far) too often, Yosemite will throw some kind of a snit and send me to my login screen!
I have no clue what precipitates this, but it is most unwanted behavior.
Anyone know about this? Anyone experience it themselves?
thank you

That's my understanding.

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I solve my problem of black screen when starting up my Mac pro, namely by the button lighting and then i saw the login screen. Hopefully it works for you too.

I solve my problem of black screen when starting up my Mac pro, namely by using the lighting button and then i saw the login screen. Hopefully it works for you.

It was the PRAM.

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I've upgraded to yosemite yesterday and now I can't login to my user account - I have login screen with Upgrade needed and Guest User. When I click Guest user I have only Safari available.
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The same here: at startup my computer shows a gray screen without my usual login pic, and the indication [upgrade needed]. If i go into the process a progress bar shows that something is happening then finally the system does the login and the computer works fine.
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Since I updated to Yosemite, it takes munch longer to startup my 2011 MBP and the login screen is distorted.
First, a black screen appears from 30 to 60 seconds, then a pixelated login screen (shown below) appears.
I reinstalled the OS X and repaired the permissions in safe mode. Disabled animation and widgets.
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Hi,
Since I updated to Yosemite, it takes munch longer to startup my 2011 MBP and the login screen is distorted.
First, a black screen appears from 30 to 60 seconds, then a pixelated login screen (shown below) appears.
I reinstalled the OS X and repaired the permissions in safe mode. Disabled animation and widgets.
Suggestions to fix this annoyance will be appreciated!

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What version of Mac OS X do you have and what kind of Mac?
Is the system rebooting when it crashes or just logging you out? About how long after the crash can you try to login again?
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See my response here for future reference. Much easier solution:
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I JUST updated to Yosemite, that went fine on my 2012 iMac. However I kept getting this MLB..... type plugin notification that would not go away. Even if i press more information or "ok" it would pop back up again every 10 seconds and kept it as an active window every time. I got very annoyed and started a purge of plugins and extensions that I read online that would relate to it.
So I guess somehow in my successful purge I deleted an essential start up extension/plugin. Because I can login successfully, but then when it attempts to load my account I get a freeze on this screen.
Yes I attempted to start in safe mode, it kept giving errors that start up failed to start properly
I attempted also disk repair. I repaired and verifyed disk through cmd + r and it said everything was fine. Rebooted, still got crazy start up screen
I also attempted D for a start up command, gave me an archaic verifying for hardware. Again it said nothing was wrong. I did the quick version, currently doing the more through version which takes up to 1+hrs and nothing so far.
I am asking can I put a start up disk, or some file on a USB start there and try to put back a correct set of start up files? All while trying to preserve my current files?
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Cheers,
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I JUST updated to Yosemite, that went fine on my 2012 iMac. However I kept getting this MLB..... type plugin notification that would not go away. Even if i press more information or "ok" it would pop back up again every 10 seconds and kept it as an active window every time. I got very annoyed and started a purge of plugins and extensions that I read online that would relate to it.
So I guess somehow in my successful purge I deleted an essential start up extension/plugin. Because I can login successfully, but then when it attempts to load my account I get a freeze on this screen.
Yes I attempted to start in safe mode, it kept giving errors that start up failed to start properly
I attempted also disk repair. I repaired and verifyed disk through cmd + r and it said everything was fine. Rebooted, still got crazy start up screen
I also attempted D for a start up command, gave me an archaic verifying for hardware. Again it said nothing was wrong. I did the quick version, currently doing the more through version which takes up to 1+hrs and nothing so far.
I am asking can I put a start up disk, or some file on a USB start there and try to put back a correct set of start up files? All while trying to preserve my current files?
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Cheers,
Natalie

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I have a sony vaio with GNOME 3. I suppose when it's not on AC power the screen should dim (it's ON on the Power Manager), but I wait and the screen's brightness doesn't drop a bit... I have another laptop, acer with Fedora 20 MATE, after a short while inactive the brightness drops. Which one is the culprit here?
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Last edited by lmello (2014-07-13 00:55:48)

In case anyone's interested:
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#!/bin/sh
DISPLAY=:0.0 exec openbox-session &
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myMIDlet.commandAction: Thread myGame ended.
myGame.createSplashScreen, informing players on connection process
myGame.run: isGameCompleted=false
mySplashScreen.showNotify, creating new mytTask
mySplashScreen.paint, repainting message screen
mySplashScreen.paint, message[0]=Waiting
mySplashScreen.paint, message[1]=on an
mySplashScreen.paint, message[2]=Opponent
mySplashScreen.paint, message[3]=to Join
mySplashScreen.paint, message[4]=the Game
mytTask.run, increasing message index
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mySplashScreen.paint, repainting message screen
mySplashScreen.paint, message[0]=Waiting
mytTask.run, increasing message index
mySplashScreen.increaseMessageIndex, index=1
mySplashScreen.paint, repainting message screen
mySplashScreen.paint, message[0]=Waiting
mySplashScreen.paint, message[1]=on an
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A Reset should help.
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Yosemite sends me to login screen - while I'm working!

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