Mac App Store, Evernote and iMovie will not let me click on anything

Question

After I open the App Store/Software Update, anything within the App Store is unclickable (even the menu bar at the top of the screen). I have to force quit the application in order to close it. I have tried to restart the computer, to no avail. I get the same results whether I open the "App Store" or I go through "Software Update". If I get an update reminder pop up notification, I can click 'install' on that, but it does nothing after it goes away. The only available update the App Store shows available is iMovie ver. 10.0.5. Everything responds to my mouse when I hover over an item, but I can't click on anything.
Also, this is happening to one other application so far. Evernote. I have used Evernote for some time without a problem, but soon after this began to occur, my Evernote started showing the same symptoms.
•     I have Sophos for virus software. I turned it off, no change.
•     I checked my firewall settings and App Store connections are allowed.
•     I don't have any Apps like Little Snitch, at least that I am aware of that would block connections

Answer 1

Some of your user files (not system files) have incorrect permissions or are locked. This procedure will unlock those files and reset their ownership, permissions, and access controls to the default. If you've intentionally set special values for those attributes, they will be reverted. In that case, either stop here, or be prepared to recreate the settings if necessary. Do so only after verifying that those settings didn't cause the problem. If none of this is meaningful to you, you don't need to worry about it, but you do need to follow the instructions below.
Back up all data before proceeding.
Step 1
If you have more than one user, and the one in question is not an administrator, then go to Step 2.
Enter the following command in the Terminal window in the same way as before (triple-click, copy, and paste):
sudo find ~ $TMPDIR.. -exec chflags -h nouchg,nouappnd,noschg,nosappnd {} + -exec chown -h $UID {} + -exec chmod +rw {} + -exec chmod -h -N {} + -type d -exec chmod -h +x {} + 2>&-
You'll be prompted for your login password, which won't be displayed when you type it. Type carefully and then press return. You may get a one-time warning to be careful. If you don’t have a login password, you’ll need to set one before you can run the command. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The command may take several minutes to run, depending on how many files you have. Wait for a new line ending in a dollar sign ($) to appear, then quit Terminal.
Step 2 (optional)
Take this step only if you have trouble with Step 1, if you prefer not to take it, or if it doesn't solve the problem.
Start up in Recovery mode. When the OS X Utilities screen appears, select
          Utilities ▹ Terminal
from the menu bar. A Terminal window will open. In that window, type this:
res
Press the tab key. The partial command you typed will automatically be completed to this:
resetpassword
Press return. A Reset Password window will open. You’re not going to reset a password.
Select your startup volume ("Macintosh HD," unless you gave it a different name) if not already selected.
Select your username from the menu labeled Select the user account if not already selected.
Under Reset Home Directory Permissions and ACLs, click the Reset button
Select
           ▹ Restart
from the menu bar.