5.33 multiple crashes involving volume envelopes

[EpicSounds]

REAPER 5.33 - 64 OSX 10.10.5

Over the past week I've had a few crashes while adjusting volume envelopes.
This project is really big, but I don't know if that's part of the problem.

Was able to repeat a crash in one scenario, other times it is random.

Video

https://youtu.be/nMiWXrbzVrI

Steps to reproduce:
two items are selected. Second item has a volume envelope.
Heal splits in items (volume envelope moves to first item)
UNDO
reaper crashes

Other times it's simply dragging an envelope point that causes the crash.

I can PM or email the project file without audio if needed.
Crash logs here
https://dl.dropboxusercontent.com/u/...crash_logs.zip