F2 RP crasches.

[Mulligun]

I'm having continuous problems with my F2 on RP. I've installed RP v12 on the original f2 US 1.02d version. I've made following modifications:

• added a few new ammo types (yes, I've followed the instructions - added pro files to data/proto/items and, frm files to data/art/iven, modified pro_item.msg and appropriate *.lst files).
• modified some barter assassinated scripts - copied to data/scripts and instered scripts.lst file.

When started a new game everything seemed to be OK - my new ammo's, modified scripts was working as expected, but later while playing i gets crashes "the memory cannot be read from" when entering a new map or starting a new game...

What could be the source of problems?