Version:           3.0.3 (using KDE KDE 3.2.2)
Installed from:    Gentoo Packages
Compiler:          gcc 3.3.2  20031218 (Gentoo Linux 3.3.2-r5, propolice-3.3-7)
OS:                Linux

First, what I get seems somewhat related to bug 80468 (ttp://bugs.kde.org/show_bug.cgi?id=80468), but isn't quite the same.

Step to reproduce:
. have french as your kde language
. delete all kdevelop config files (.kde/share/app/kdev* and .kde/share/config/kdev*)
. start kdevelop
. change UI mode to "tabbed"
. open a project (in my case: imported C++ with custom make files)
. close kdevelop
. open kdevelop

The result is that kdevelop will reopen as an empty grey window. Only the toolbars and menubar are there. If I select in the menus one the "View -> Tool views -> Show xxx" entries, I get a separate window containing all the dock windows and child windows, but nothing can be docked back into the main kde window. The situation is then similar to that described in bug 80468.

Other usefull information:
. This doesn't happen if the kde language is english instead of french
. This happens only if I change the UI from the default IDEAL mode
. The project in question has been generated by kdevelop 3.0.3 with "import existing project".
.
After investigating, it seems kdevelop produces a bogus .kde/share/config/kdeveloprc file. Specifically, the [dockSession_version1] section contains a long line "NameList=xxx,xxxx,...". If I remove it, kdevelop is back to normal, but only until the next time I launch it, and kdeveloprc is rewritten.

I hope someone can reproduce the bug, and that the information I provided will help locate it. I can provide more if needed. Finally, kdevelop 3.0.3 was compiled by the regular gentoo ebuild, with very mild cflags (just plain "-Os").