Calendar scrolling in reverse

[gracedman]

We love our Zimbra so far but there is one bug/problem that our users find infuriating. Not always but often enough to be a problem, when users create a calendar entry by clicking and dragging the mouse through the hours for which the appointment should be, the scrolling jumps way too far. When the users try to drag back to return to the proper end time, instead the calendar keeps scrolling forward. Sometimes, even letting go of the mouse button doesn't work - it scrolls until the mouse is clicked. By then, the 90 minute appointment is now thirteen hours long!

Has anyone else seen this behavior? Is there a way to fix it? Is it a configuration issue or a bug? Thanks - John