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Mavericks resizes application windows and moves them around

This problem has started since I installed Mavericks. Typically I have Firefox and Outlook loaded most of the time, occasionally other applications such as Spotify. My wife also has an account on the iMac, so she logs in, leaving me logged in. When I switch back to my account, the applications have resized themselves to odd small sizes, and Outlook is sometimes half-way off-screen and can't be moved (if I drag it back on-screen it just snaps back to the off-screen position).


I have found a way to prevent this, and this is to ensure my wife minimises the applications first. Strangely none of her applications (Firefox, Thunderbird, iTunes) move or resize.


Certainly a bug that's arrived with Mavericks, so Apple if you're reading this please fix it.

iMac, Mac OS X (10.6.8)

Posted on Nov 2, 2013 3:25 AM

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156 replies

Dec 5, 2013 8:46 PM in response to CamberleyDaz

Same here. It's driving me crazy. I think it happens mostly or exclusively if the computer has gone to sleep. I only have one monitor. I wake up the computer and frequently app windows are somewhere on a ghost monitor and I cannot retrieve them. The only way to do so is to close the app. If, for example, a Word doc needs to be saved, the app window miraculously appears with the prompt, but even if I click "cancel" the document window disappears again. New document windows appear off screen as well. I get this frequently Word, Mail, Safari and, I think, less frequently with other apps.

Dec 6, 2013 11:25 AM in response to CamberleyDaz

I managed to fix this on my Mini. Well... if you can call it a fix. The problem has something to do with one or more of the system sleep/idle functions from what I can tell, most likely for the display. Since in my case I don't want anything to sleep ever (htpc/server is always on), I installed Caffeine and turned it on. Now any windows that I leave open are always right where I left them!


By rights, changing the sleep settings of the display in preferences should of been all that was needed, but that wasn't the case for me. I'm not exactly sure what's going on when the system decides to move things around, but I think it has something to do with the display not showing as connected (since it's a TV and not on all the time) and after a time forgets the connection or something. I dunno. Definitely one of the stranger happenings.

Dec 9, 2013 7:45 AM in response to CamberleyDaz

Apple support case number 525850045 - opened 9th Nov 2013.

Only had iMac since 24th Oct and did this from scratch.

Clearing Saved Application States / clearing application caches didn't resolve issue


Bug 15451533 opened 12th November. Heard nothing back.


Had another call wth support wh got me to reboot holding alt-cmd-P to reset the PRAM. Didn't work.


Re-installed Mavericks - didn't work.


Tried turning off parental settings - didn't work.


My workaround is to alt-cmd-D to hide the dock and do it again to unhide it. This unlocks the collapsed windows. Takes a minute to re-size your windows though....

Dec 14, 2013 11:27 AM in response to CamberleyDaz

I also have this problem since installing Mavericks on a 2009 imac. Then did a disk reformat and clean install because I also experienced extreme slow downs (may have been partly related to Sophos). Speed and general responsiveness are now very much improved, but I still suffer the random window resizing issue. Have yet to find an alternative to restarting the application affected. I hope we see an update that addressed this issue soon.

Mavericks resizes application windows and moves them around

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