While editing in QT Creator, locking the screen (which enables the screen saver immediately in my case) causes QT Creator to lose mouse focus upon an unlock. By that I mean the blinking cursor (i.e. caret or insertion point indicator) disappears entirely and I am unable to edit anything. The quick solution is to alt-tab to something else, then back to QT Creator, which seems to promptly "kick" it into action. Simply using the mouse to click on the editor doesn't seem to work.

This bug is occurring on three separate machines, all running Ubuntu Linux 10.10 and QT Creator 2.1.0 (I haven't tried to replicate it on any other platform). Note that I could only replicate this bug after locking and/or having the screen saver running for a while (at least ~10 seconds). Locking and unlocking immediately didn't seem to cause it to occur.