Smart Rendering Problems with Videostudio 7

[VIDEO_FREAK_1]

Hi all,
my project consists of several MPEG-2 clips (TV recordings) and some titles. As the source footage is all DVD compliant, I tried the 'smart rendering' feature first to save time. As expected, only the titles were rendered, everything else wasn't touched.
But I'm not quite happy with the result.
First, a few scenes of the non-rendered parts of the film (those which already were DVD-compliant) appear blurry, looks as if the camera is vibrating or slightly out of focus. Because of smart rendering (the affected parts weren't encoded), I suppose this can't be an encoder problem, can it?
Second, something went wrong at the cutting points. Some frames after the cutting points are all covered with boxes. Looks like VS has messed up I-, P- and B-frames around the cutting points.
Third, the titles are in very low resolution and quality. They look like 8pt Font zoomed to 64 pt.
After this disappointing experience, I disabled the 'smart rendering' feature and did the encoding again, using exactly the same settings and project properties as before. Now the result was very good: smooth and seamless cuts, sharp and brilliant titles. Of course, rendering took much longer and quality was a bit worse due to re-rendering. That's why I still want to use that feature.
Now I'm wondering what's wrong with smart rendering. Why does it produce crappy titles (titles are always rendered, aren't they?), while rendering the whole project using exactly the same settings works fine with titles? And what goes wrong at the cutting points?
Video Studio Version is 7.01, source MPEG-2 footage was recorded using a Hauppauge Win TV PVR 150.
Any hints to avoid this would be greatly appreciated.
Regards
Michael

[kebrinton]

I used UVS7 for several months and never had this problem. But I was starting out with DV .avi files and creating my own MPEG files from them. Before I rendered a file to MPEG, I created a new .AVI video file incorporating all the titles, background music, etc. That's the recommended procedure when you start with DV .AVI.

[VIDEO_FREAK_1]

@kebrinton,

thanks for the reply. But I'm afraid I can't do it like you recommend: my source footage almost always is dvd-compliant MPEG-2 (I don't have a digital camcorder, just a TV card). It will take too much time and quality to convert MPEG-2 into AVI, edit, and then convert back to MPEG-2. Actually, I purchased Video Studio mainly because it has the smart rendering feature.

Does anybody have similar problems? How does VS 8/9 or Media Studio Pro work with Hauppauge Win PVR recordings?

Regards, Michael