I am using Linux version (Ubuntu 12.04), and is encountering similar problem.
In fact I also crashed a lot in M3 too, I am not sure how did I get pass it...
I tried to run M6 with debug build for twice.
For the first time, last line is:
WARNING: "Invalid model number -1 requested. Please post the call stack where an SCP coder can see it." at modelread.cpp:2935
For the second time, last line becomes:
ASSERTION: "!(delta_time < 0.25f && vm_vec_dot(&objp->orient.vec.fvec, &tvec) < 0.1f)" at aicode.cpp:1236 A ship rotated too far. Offending vessel is Gold 1, please investigate.
In the second run the game existed right when the frigate smash into a Cylon Basestar. Not sure about the first time.
Complete log for the second time is attached. I accidentally deleted the first log.
I also have a copy of console output captured with
./wxlauncher &> ../../log.txt
Hope it would be helpful
[edit]
System info:
AMD Athlon(tm) 64 X2 Dual Core Processor 5600+
4GB system RAM
Radeon HD 4670(with 512 MB VRAM)
[attachment removed and sold on the black market]