Comment 2 for bug 1241604

I discovered the problem while trying to solve an issue with widget styles: when a KDE application started, it ignored the widget style specified on System Settings and defaulted to some ugly style. Re-setting the widget style and applying the change on System Settings made the running applications to obey the setting but upon closing an application and re-launching it ignored the setting again.

Browsing the 'net I discovered some old reports that recommended to delete .config/Trolltech.conf and run

kbuildsycoca4 --noincremental

which pointed to the faulty file. I didn't change it. The command just created a new Trolltech.conf file and the problem with the widget styles is gone but, looking for related problems, just tried Muon Software Center and it crashes a few seconds after opening. The Crash Reporting Assistant pops out but it wants to install the debug info for creating a better backtrace.

I don't care about Muon Software Center and I guess that this crash is specific to my machine (otherwise you would already know about it) so I'm reluctant about going ahead with the crash report and install a ton of debug info, but if you are interested on it, I'll do it.