Hi Claus-Peter,
We have been doing some updates that Adobe had requested for OpenHD certification which has delayed the 5.2 release by about 10 days.
The good new is that we have finished this and are releasing 5.1.1 today, so know we can now get back to 5.2 and get it out ASAP.
I would recommend updating to 5.1.1.
Cheers,
Regards,
Matt
Blackmagic Design