Hi Teddy, on one of the times that it hanging can you please go in Activity Monitor and select the MoI process.

Then on the Activity Monitor toolbar there's a gear button that pops up a menu with one of the items being "spindump". Can you please make one of those and send it to me at moi@moi3d.com ?

Also does MoI v4 work ok there or does it have the same behavior as the v5 beta?

Thanks,
- Michael