5.2.1.2 Beta (December 16, 2008)
New: Improved Preview thread model, which can react faster and be more stable.
Fix: A freeze problem when Preview is running in certain cases.
Fix: A crash problem when Preview is running in certain cases.
Fix: A crash probem at start of converting DVD in certain cases. (DVDFab Mobile
Option)
Fix: A/V sync problem (audio is slightly ahead of video) in certain cases. (DVDFab
Mobie Option)

http://www.dvdfab.com/download/DVDFab5212Beta.exe