After updating creator 9.0 to 9.1 I have to activate each time that I use Video Wave or My DVD - the activation works and I can use MPEG2. Should I have to activate per usage or should one activation provide MPEG2 as it did with version 9.0 (Using Vista Ultimate)?

You should only need to activate once unless activation was not successful.

I have the same problem- I was asked to activate MPEG-2 codec every time I started any module from Roxio home- even though every time the activation was successful. Now, however, Videowave does not ask for activation (though other modules including MyDVD do) and I cant work with MPEG-2 formats including vob in Videowave. Irritating...
Any ideas very welcome!

Thanks all for the feedback - have opened a ticket - will update this thread when I get a response.

Run the program (video wave or mydvd) as the administrator and complete registration