I also have the same issue.
2 X32 Racks, both with uTrack cards in them running the latest firmware.
Both record crackling across all channels (running 16Ch in each).
Also over USB or ethernet the uTrack software will not recognise either card. I can browse to them to do a firmware upgrade without issue but the actual application can not see them..
Given both systems are doing the exact same thing, I am presuming it is a software/firmware issue.
The crackling is a major issue as it makes the box unusable.
Should I roll down to an older firmware ? has this been tested with an X32 Rack ?