Blight map / encounters crashes

Ok, without MTX I got no crashes in 20+ maps. Now question is, why/which mtx causes crash when trying to build or upgrade Blight tower :D

First time after ~150+ Blight Maps without mtx, I managed to crash, upon clicking empty tower spot to build a tower of course. So while mtx greatly increased the cnahce of it, it is still a problem even without them, just very rare it seems. Last client.txt lines are still Cassia's stuff, nothing else. There is another dxdiag report in case it has some changes.