Version:            (using KDE KDE 3.5.6)
Installed from:    SuSE RPMs

This is a problem with Kontact's calender.

Create three appointments starting and ending at the same time: they appear
next to each other in the calender view, each one third of the usual width of
an appointment with no other at the same time.

Delete one of them: the two others still take a third of the width, with
another third being open.

I think that they both should take half of the available space.

Delete a second one: the remaining one resizes to full size. This is okay.