Do you have to rebuild a project after you upgrade?

Question

I have a rather large DL iDVD 6 project that I burn about 20 discs at a time. I usually let it encode overnight and make the copies the next day.
I recently updated to version 6.0.2 and now get the beach ball when I go to burn. I repaired disk permissions and trashed the prefereences and now get the beach ball when i try to open up the project.
Do I need to rebuild the project from scratch because I updated? Is this a standard thing or just a fix for a hiccup?
As a note I have 2 gigs of RAM and about 14 gigs of free HD space
Thanks in advance.
John
Powerbook G4   Mac OS X (10.4.6)   15"1.5ghz 2gb silver-love it

Answer 1

I have a rather large DL iDVD 6 project that I burn about 20 discs at a time. I usually let it encode overnight and make the copies the next day.
You can create a disk image and avoid the re-encoding. Then use Toast to create a DL DVD. Don't think Disk Utility can do that...
As far as your problem. Follow Mike's suggestion regarding the themes. Or you might try re-installing iDVD 6 and updating to 6.0.2. Follow these directions:
http://docs.info.apple.com/article.html?artnum=303252