I have played a lot with the v1.1.1-870-g194e9ed build and abusing a lot the save states to see if the "crashing regularly" problem i had with it was fixed, and with this build (that i'm still using) i have not crashed once.
I suggest for you to give this build a try and see if the mission you're having crash with 1.2 is working OK in that older build (that to me is rock solid with GEB on my system).
http://www.ppsspp.org/downloads.html#devbuilds
I'm playing GEB on D3D9 and with "Skip Buffer Effects" too (so i don't have to hurt my eyes with GEB silly bloom) in case it has an importance between crashing and not crashing.
I gave a test to the mission "Fallen Angel Egg" and didn't crashed.
I suggest for you to give this build a try and see if the mission you're having crash with 1.2 is working OK in that older build (that to me is rock solid with GEB on my system).
http://www.ppsspp.org/downloads.html#devbuilds
I'm playing GEB on D3D9 and with "Skip Buffer Effects" too (so i don't have to hurt my eyes with GEB silly bloom) in case it has an importance between crashing and not crashing.
I gave a test to the mission "Fallen Angel Egg" and didn't crashed.

