how to set credits start with Xvid 1.0RC3 and DVDToMKV??

[mac1929]

DVDToMkv guide reads that dev-3 xvid cannot use external credits function and dev-4 (1.0) cannot use internal credits function.

I'm using 1.0 RC3 so if I follow the guide I should use external credits function but DVDToMkv pops up an error that says that Xvid settings are wrong.

Is this a bug or there's something I'm doing wrong??