AM hangs loading trainset, AM stops loading and exits Options

[prr4ever]

I use Activity Master often with no problems at all. Today I tried loading an activity, created by Activity Generator, and as the AM was reading the trainset it hung up about 1/4 into it. I then tried another activity which was working fine in AG last week. It also hangs up shortly after starting to read my trainset. It then exits to the desk top with no reasons given.

I opened the trainset, no problems there. CB reads it, RR reads it MSTS editors read it and MSTS runs fine. Finally I deleted Activity Master and reinstalled. Still the same problem.

Anyone able to give any hints for this and how to fix it?

There have been no additions to my system, no changes to MSTS, or anything of that sort since last week when AM was working fine.

SYSTEM SPECS
Dell Studio XPS 9100
INTEL I7-920 PROCESSOR
WINDOWS 7 HOME PREMIUM 64 BIT
12 GB TRI CHANNEL DDR3 SDRAM AT 1333 MHZ
ATI RADEON HD5670 1GB GDDR5
1 TB 7200 SATA 3.9 GBS 16 MB CACHE
CREATIVE SOUNDBLASTER X-FI