After merging (file menu), showing any operator causes wz4CE to crash. What could that be? An init problem?...
Man... It's a critical bug. Veeeery annoying...

it seems to be an old bug, it crash with original wz4 version too.

after merging if you save your file quit wz and reopen it it works...

That's better, but still I wonder what could be the problem... It's just a simple native format data import...