Preview / Thumbnails for videos not showing

Hello Guys,
I was hoping someone can help me.
I usually import photos from my Canon 400d and iPhone 4 and 3GS and it's been working fine for a long time. A couple of weeks ago, it stopped showing the thumbnails for photos and videos.
My settings for import are to render previews with minimal size (and has always worked great like that). If I try to render standard sized thumbs after import, sometimes it works, and sometimes it hangs with some photos. I can quickly fix that going into "Develop" mode where it creates the preview correctly.
But for videos, because you can't go into develop mode, it just hangs trying to build the previews.
Note that all videos previous to 07-22-2011 show the thumb correctly.
Some more info on my system and the things I've tried.
My system is a Macbook Pro 2.66 i7 with 8Gb DDR3
Lightroom 3.4.1 - 64 bits
Cameras Canon 400d, iPhone 4 & 3GS
I'm running Lion OS X now but I can see in my catalogue that the blank thumbnails start appearing a week before I upgraded.
My catalog is not too big, around 3K photos
I tried getting rid discarding all the 1:1 previews and rebulding them again. I works OK for the photos but the rendering hangs when the get to the videos that have been imported after 07-22-2011.
I checked the video properties and they are all the same as old videos (nothing changed in my iphone) they are .mov files h264 with ACC audio (same as all the previous ones that show the thumbnail correctly)
I tried deleting the .lrdata preview file, and recreating all the previews in standard-size and nothing, then tried with 1:1 preview, but again it hangs when it gets to the videos
I created a new catalog and imported 2 new videos. getting the same result.
Can anyone help?

Thanks Geoff.
I used an app called app zapper to completely delete 3.4 and then installed 3.5 RC and the general speed seems to be a 'little' bit better.
But video seem to screw up everything. Previews are still not rendering for videos and as soon as I get into a mixed folder (videos & images) Lightroom starts to lag badly...

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Message was edited by: John Cogdell - added PS

Preview / Thumbnails for videos not showing

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