I have a NTSC DV project I'm exporting as Flash. It's got one menu, for chapters and it's about 40min long. I hit "Build" about 2hrs ago and can see no discernible progress. It just says "Transcoding..." and "Chapter 1". I'm sorry to be vague. I know very little about Encore so I don't know what's pertinent.
Mac Pro, 2x2.66GHz Dual-Core Intel Xeon, 4GB 667 DDR2, CS3, I think that's everything.
this is common problem if you have upgraded your Quicktime past 7.3.1 you will need to reinstall Q 7.3.1 using pacifist program very simple and you can use the free-version just download Q 7.3.1 and use pacifist to reinstall http://www.charlessoft.com
hope this helps