Lightroom 3.4.1 looses video thumbnails - Mac OS Lion

I remember this having been brought up sometime ago (and happily sank into oblivion), and certainly not specific to OSX Lion (had it all the way before), -
Lightroom is prone to loose video thumbnails in the Grid view at random, i.e some are preserved, and others are displayed all black, see screenshot attached. This happens after some time, apparently after some successive imports of fresh images/videos to the catalogue.
The only workaround is to remove the clips from catalogue, then reimport them - is hardly acceptable since you loose all keywords in the process.
Will anyone at Adobe finally take heed of this issue? Not a dealbreaker, but certainly bothersome.
Users of Lightroom who suffer from the same issue, please add to this thread to make it more credible.
LR 3.4.1 on Mac OS Lion.
Thanks.

perhaps somebody found a way to fix the thumbnails without removing videos from the catalogue? Please share!

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