And also - I saw someone made that workaround for photoshop. Is the soruce anywhere? or is it just a case of making an app that simulates posting a fake alt key press to reset it?
Did you ever get this resolved, I have the same issue and cannot find a solution anywhere. Thanks!
I was having the same exact problems with Flash Professional after upgrading my OS X to Lion. (Alt/Option key seems like it's stuck / Duplicating objects on stage just by clicking and moving the object.) My main problem was not being able to curve a straight line with the Arrow tool. Instead it would create a corner point as if the Alt/Option key was being held.
I stumbled upon this thread before finding my solution so I thought I'd share what worked for me.
Here is the thread I found with the solution that worked:
Basically I had a program called AirDisplay installed. AirDisplay allows me to use my iPad as a second monitor for my Mac. So if you have this program installed, or one similar to AirDisplay, uninstalling this program may get your Flash Professional to work correctly again. It certainly did for me to my amazement.
Hope this works for you or anyone else who is experiencing this weird and frustrating problem!