Version: KDE 4.2 RC1 (using Devel) Compiler: gcc 4.3 OS: Linux Installed from: Compiled sources Sometimes Shift-Delete deletes messages, sometimes nothing happens. When the problem occurs, the Delete button in the toolbar still works. I haven't noticed any pattern to predict when the fault will occur.
Hmm ... as I can not reproduce it, I'll close this bug for now. If you happen to see this with the current 4.3 KDE version, please reopen.