Version: 3.5.5 (using KDE KDE 3.5.5) Installed from: Gentoo Packages Compiler: gcc 4.1.1 OS: Linux -> Open 2 windows. One is covering a little area of the other. -> if mouse cursor stay over "on top" window, there is no problem. -> move the cursor over the window below. Normally, this must give this window the focus : at this moment, the 2 windows are blinking, cpu is 100% and this blocks everything. -> I think of a focus bug in kwin. Kwin wants to give the 2 windows the focus at the same time, so it's blinking. -> If I choose "Click to have focus", no problem. -> This is 100% reproducible. Sorry for my English. NB: Compiled every kde versions, never had problems. 3.5.4 version compiled with exactly the same system and no problem.
*** This bug has been marked as a duplicate of 135250 ***