I have what might be useful information on a failure mode.  I have a consistent program hang on DS 2015 SP1.  MacBook Pro 2014 OS X 10.10.3

When I have a tool open with a hitbox, the program frequently hangs when passing over an intersection.  An flag apears and that's it.  Terminal hang, application not responding.  I force quit the program.  

I assume that you are not receiving crash reports since FxCrashReport.app never terminates.

I really really don't like your new version, but I assume that you are not interested in opinions.

Alan Adams