Two problems with video: Import and gamma

I downloaded and tried LR4 today and found the new adjustment features quite impressive. I was also very eager to try the new video facilities. Woudl have loved to...
Running on iMAC with Lion, pictures and video from a Pentax K5. Video is full HD @25fps. Never had any problems in LR3.6 with importing or cataloging my videos.
When I tried to import already downloaded photos and videos two things happend:
First, some of the videos are not in their "correct" position in grid view, while others are correct. In finder date and filename are correct.
Second and more complicated, videos are completely off in colors and play with interruptions. I attached of few screen shots of what it looks like in LR3.6 and LR4.
Any ideas?
Thanks,
Joachim
p.s. just tried direct import from camera, with the same effect, at least regarding colors and slow video replay.
LR 3.6 Grid view LR 4 Grid view
QT screenshot of video LR 4 video screenshot
Message was edited by: Jo Stretz

Thanks,
did not get a PM yet. After trying with several other sources I finally found the "mistake" after installing and trying LR4 on my MBP. The reason for the color shift is that I switched on the development preset Auto tone, which for video gives this crazy results. Other presets work just fine, even giving a warning that some of the adjustments might not apply in video. Auto Tone and the video is off.
Hope this helps.
Best,
Joachim

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Computer:
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