Version:           3.4.2 (using KDE 3.4.2, Mandrake Linux Cooker i586 - Cooker)
Compiler:          Target: i586-mandriva-linux-gnu
OS:                Linux (i686) release 2.6.12-12mdk

Approx. 50% (perhaps a little less) of the times I go and drag a scheduled task in the calendar view, the size of the task changes (visually) and it's quite uncomfortable. Refreshing the view causes the task to be displayed with it's normal height.

I got a similar problem under KDE 3.2.3 (with the difference that in the past sometimes the task just "dissapeared" sometimes, which is not the case now under 3.4.2).

In testing to see if I could make this reproduceable, I've found that if you just create a task and do several drags to change it's ending hour, after some two or three drags you start to observe a little "shake" in the movement, and after that the size is bigger that original. If you keep on draging a few times you see this behaviour repeat as the size keeps growing even further.

As I told before , just refreshing the calendar view restores the normal task size.
There's no data loss or random rescheduling, but it's not nice, so please if someone could check it I'd be more than glad.

Greetings!