Locked task and moving tasks issues.
 

Somehow I locked the end date for a task and could not move it. It was frustrating until I figured out that it was locked. Now I see the icons for lock and unlock it makes sense.

I find that moving short tasks is way too hard. I want to slide it to another day but keep the time period and I end up changing the length of time, the percent completed or the locking/unlocking status most the time. It would be useful to be able to lock the length of time and then freely move the date.

A few other people have also mentioned that the controls are kinda hard to distinguish. We're pondering the best fix. I've added your comments to the conversation.