[Terje Moen]

Then there must be a problem with your AJA unit. Could it be PAL/NTSC setting?

A sync generator and a time base corrector (TBC) are not the same thing. A sync generator generates a sync pulse for all your equipment with a genlock or ref input. The TBC needs sync from the generator, and you can use it to sync a source with no genlock input, i.e. a DVD-player.