Konqueror/Dolphin file managers very unstable

[Jerome Yuzyk <jerome@xxxxxxxxxxxxxx>]

I've always liked Konqueror's file manager, but it's been completely 
unstable ever since I moved to KDE4. Many operations seem to hang doing 
nothing and then suddenly wake up. Crashes are routine. I switched to 
Dolphin, thinking Konq had been abandoned, but it's not a lot better. File 
previews are 50/50 whether they'll show or just spin. 

Right now I'm on KDE 4.5.3, Fedora 13. Nothing else misbehaves like these 
two apps, so maybe there's some kind of cache corruption I should clear out 
or setting(s) I should avoid?

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