Some people have been experiencing issues with the HC encoder and batchmux not completing the dvd files properly because of bitrate spikes. If you get this problem it might be advisable to both lower your bitrate (6000-7000 range) and use the QuEnc encoder instead.
If you use the above tutorial and you go to your completed dvd folder and you see that only some of the vob's were created then your having this issue. This usually only happens if you are trying to make a DVD with many different video formats. For example it happened on my AMV DVD in my tutorial and you may have noticed I had QuEnc activated this is why.
I noticed this thread has quite a few views and no comments if you experience any issues you can pm them to me or post them in this thread and I will try to help or you can head over and ask the author of FAVC yourself: http://forum.doom9.org/showthread.php?t=106677
In other news Mr_Odwin is working on the 1.07 version which is supposed to bring better menu support! ^.^