The only way the widescreen mod could be related to this crash is if you had previously entered the silo and then changed the resolution. Apart from that, I don't know, you should have a look at the fixpack forums.
As a workaround for continuing the game, there are two alternative ways to enter the prison in order to get to the deva. The first is a secret entrance at the junkyard that leads to the prison and the second is to talk with a guard and get yourself arrested after agreeing to any of the murder plots.
Thanks so much! I'll try one of those now. Thats awesome.