before i changed to 5.6b1 i had no problems with wordclock sync at starting. The cables and terminator are 1 year old and 10" long. The clock is generated by a RME Fireface 800.

When i go to the setup the source is wordclock and the "ADAT" status says "slipping".

And if i pull the clock cable out and then back in, the clock is there.

It must be a problem of the software, because i changed the cable and the terminator and it is still the same. And the cable are original wordclock cable.