Blackmagic Design Desktop Video 10.5.4 on Mac OSX 10.10.5 keeps crashing FCPX 10.2.2

It's becoming annoying, BMD Desktop Video 10.5.4 crashes FCPX at every occasion - like dragging a clip across the Timeline.

I've had it, I've retrograded to 10.5.3, and the rest of the day has been fine, no crash.

I was on Desktop Video 10.5 before and it was stable. This machine has a DeckLink Mini Monitor PCie.  I will stay on 10.5.3 and wait for the next iteration after 4.
I'm not alone: http://forum.blackmagicdesign.com/viewtopic.php?f=3&t=44128

--- Update
DV 10.5.3 is also unstable, although less than 4.  I'm back to 10.5.

--- Update
DV 10.5 is working fine, no crash so far.

What is your experience with 10.5.4? Stable? Unstable?