PhAb crashing and corrupting project

Hello,
I’ve got a problem with PhAb. When I import a PNG image to put onto a
PtButton, PhAb crashes, and when I reload it, my project is corrupted
(PhAb crashes on opening the project), and I need to revert to a backup.

Anyone had this problem, is it a known bug?

I’m on 6.2.1.

Cheers

Garry