Very strange that.
I'm using 2.1.5 and get it all the time - even for the single face in a cube like ggaliens reported do not have the problem.
I did the same test with the older 1.5.3 I have installed here at work and it works as expected.
Please do a test for me. make a backup of your wpc_rebion.beam and replace it by this one.
It's under ...\plugins\commands folder.
In this situation, I'm expecting you to get a crash since it fixes my crash.
I'm using 2.1.5 and get it all the time - even for the single face in a cube like ggaliens reported do not have the problem.
I did the same test with the older 1.5.3 I have installed here at work and it works as expected.
Please do a test for me. make a backup of your wpc_rebion.beam and replace it by this one.
It's under ...\plugins\commands folder.
In this situation, I'm expecting you to get a crash since it fixes my crash.