Confirming BSOD when launching MBAM on Windows 10 Insider Build 14951.
Fault on mwac.sys
As seen by others on the Fast track of the Windows Insider program.
Beta 2 of Malwarebytes 3 is now available
Folks on Insider Previews will do better with that. I would simply suggest that you first have build 14965 Windows 10 ( not earlier builds) prior to getting our Beta.