kde 3.3 no file previews in konqueror

hi - have recently upgraded to kde 3-3 via the Suse RPM updates and everything seems to have gone fine...only one minor problem: - konqueror no longer shows previews of any mimetype. previews are enabled and I have checked the settings for the various filetypes that should be displaying previews and everything 'seems' to be in order. has anyone else experienced this problem?...or something similar? Any suggestions would be welcome - although I usually have previews off, I find it a useful feature to be able to turn on occasionally via a shortcut key. thanks, Chris