Just stumbled on this thread after some weeks tearing my hair out due to this problem.
Only it wasn't exactly as described. It happened to me not just trying drag-and-drop but was 100% reproducible on a particular application (MegaSeg) after just clicking a few things. Happened also in Firefox, Chrome, Finder, Mail...
I DO have AirDisplay installed.
Currently the problem has disappeared. I discovered that a re-instal of Lion directly was not enough. Problem still there. So I did a clean install and restored data and apps from a backup clone. All working so far. Thing is, this re-installed AirDisplay as well. I haven't yet tried to run AirDisplay and am very nervous about doing so.
Why, oh why, does Apple ignore us?
I fixed it - I had AirParrot and AirDisplay and LogMeIN installed. Given the timeline of when I noticed the problem, I believe AirParrot or LogMeIn was the cause of the problem for me.
I ran the AirDisplay uninstaller app and then I deleted the following files and the problem is now gone! YAY
Deleted files were:
LogMeInSoundDriver64 7.01.34 PM.kext
YES I know that logmein files are sound drivers - but I wanted to rule out all apps that could cause the problem.
I thought I was going to have to go through hours of a new install.... Happy I don't have to now.
I think it is a bit disapointing that the installer package for the AirDisplay and AirParrot apps don't give some sort of warning about certain models may experience difficulties.
BTW - I used the "Find Any File.app" to do a search for "Air" and ".kext" and used a bit of fuzzy logic to decide to delete the APExtFramebuffer.kext files and others that were modified or created on the same date as the AirParrotDriver.kext files..
That's my 2 cents....
In these weeks I have the same problem and before discover my solution, I tried the following points:
1. reinstall Lion 10.7.3 for 2 times!
2. reinstall Snow Leopard
3. uninstall some programs like NTFS Paragon, Total Finder ...
I thounght the problem was the last update of Lion or program that modified the system (NTFS rights, Finder,...)
5 minutes ago, after that I was getting angry again..my girlfriend Liza noticed that just before the problem, I moved by accident the Logitech mouse that I use under Windows-Bootcamp!!!
So we tried "Sleep/wake- mode" but the Dock was anyway locked...
After that Liza said: "Try to unplug the muose that you moved before..." I thought: "are you serius!?!?
I didn't believe it, but magically it solved all problem and the Dock restarted perfectly!
After that I tried to plug the mouse again...and immediately the dock freezed again!
God bless Liza!
Well, I really am happy for all you techies who know which files to manipulate and delete to get this thing to work again, but I am fairly clueless when it comes to trying to figure all that out....and who has the time to spend hours doing it?? I can't try them all.....can I?
My drag & drop since installing Lion has been basicly nonexistent except for the occasional random incident
(I keep trying ) It also occasionally picks up items when I don't intend it to. As I said, random, seriously random. No easy fixes? I've tried several of the suggsetions....and nothing. I don't have Airparrot or any AppleTV extras, nothing unusual on my Mabook pro.
Any more suggestions.... I would be grateful.
I have seen all of these symptoms as well as synergys giving a locked by mouse button error until I sleep / awake the system.. also extended screen lock seemed to fix the problem as well. I Fixed with the uninstall of AirDisplay restart and all seems back to normal.
Late 2008 MBP 15"
Mac OS X Lion 10.7.3 (11D50)
Please see our blog post about this bug:
It describes the problem and explains a workaround. In Lion 10.7, the bug affected a broad list of Macs, including models of MacBook, MacBook Air, MacBook Pro, iMac, and Mac mini. As of 10.7.3, they've fixed it for all but a handful of 15" & 17" 2008-2009 MacBook Pro models. We are hopeful that Apple will continue to make progress in fixing this bug.