I noticed this recently with CS5.5 as well but now in CS6 and i can't figure out what is going on.
I have a timeline with clips. I created the timeline form scratch and added a few clips. Nothing earth shattering. I moved them all around and then left for a while. When i came back, the clips in the timeline were locked in position. I can't move them. The tracks are not locked, the clips are enabled, when i try and drag them, they just flash but do nothing.
Now in CS5.5 if i waited long enough, then would eventually free back up. I haven't waited that long in CS6. Does anyone have any idea what would cause this?
I have closed Premiere and reopened and that didn't help
I tried creating a new sequence and can't drag anything into it. Its as if all dragging was diabled. I am however able to move them with the keyboard. I am also able to add to the timeline using the , and . keys. Just no dragging.
I can select them and lasso them but can't move them. it is the strangest thing
I've never seen this behavior before.
If I had to guess, I'd say something was wrong with your graphics driver.