I have this problem too with kde 4.4.5, even thought I have disabled video previews and limited previews to files smaller than 5 MB.
It seems to be related to the folder preview, as if I disable folder preview, the problem goes away.
I have this problem too with kde 4.4.5, even thought I have disabled video previews and limited previews to files smaller than 5 MB.
It seems to be related to the folder preview, as if I disable folder preview, the problem goes away.