Max 2019, RC1
Just got a crash while playing with the VFB - displaying the Caustic render element, storing VFB to history and comparing A/B.
Minidump attached, hope it helps.
More info - Max didn't crash to desktop, it just froze while the crash error report dialog came up. Upon closing the CER dialog Max sat there with one thread active but otherwise non-responsive, had to force-close it.