Panel seems to crash when switching between open files in Kile

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http://askubuntu.com – I'm running Ubuntu 12.04 and after splitting a single tex document into multiple files I noticed a strange bug. Here are the steps to reproduce the problem on my machine: Opening Kile, it automatically restores the files that where open on last use. Switching to a different open file, either by clicking on the tab or using the Alt+Left/Right keys. About one second later the panel content disappears (except the program's title 'Kile') and the menu bar is integrated into Kile's program window. Another second later, the panel again fills up with it's original content (in serveral steps) and the (HowTos)