[Steven Baumgardt]

Thank you Mary,

you were right:

It was a problem with Camtasia’s video codec. I tried to re-compress the file after I had recorded it with Camtasia before importing it into Vegas — and voilá, it worked!

Also, Camtasia supports to record using a different codec right from the beginning. I guess I could have done that as well.

Again, thank you very much for your kind help.

Best,
Steven