I am having similar problems with 6.1.3. Wanting to connect 3 BMD ultra studio mini recorders before (1280x720 at 60/50fps) to a MacPro (2013). When I connect the thunderbolt cable one of the following things unpredictably happens:
a) Resolme crashes
b) Resolume recognises the device, but it crashes when I switch sdi to hdmi input or vice versa.
c) It seems fine till I connect a second BMD ultra studio mini recorder, then it crashes
d) sometimes I manage to connect 2 devices and the above only happens when I connect a third device
After resolume has crashed I can not restart it and have to reboot and restart and hope/pray...
I have tried Zoltan's suggestion, but it has not improved the situation. If I am lucky and I get all 3 devices connected I can only use 2 sdi inputs and one hdmi input. Bus configuration (what gets plugged where) seems to make no difference here.
On top of this it seems that if I get lucky and get everything to work after numerous restarts resolume will recognise the BMD Studio recorders in a seemingly random order (not the order they were plugged in)
I have a show looming closer and closer and no reliable setup. I have convinced several opera theatres in Germany to run shows on Resolume with live chromakeying stage setups in the past with Resolume 5 and this exact 3xBMD Ultrastudio setup, but now I am loosing confidence in the system...
Any suggestions would be appreciated!