I had two instances of BFGMiner 3.0.0 crash simultaneously today; each was running on its own computer.  Both video cards are MSI Radeon 7770 running AMD's Catalyst 13.1 on Windows 7 64 bit OS.

There was an interruption (my ISP connection went down) followed by a new block detected message and both instances of BFGMiner 3.0.0 trapped.  Due to the trap, I wasn't able to gather any further info.

Machine #1

Faulting application name: bfgminer.exe, version: 0.0.0.0, time stamp: 0x515f07a4 (2013-04-11 17:22:45.000000000Z)
Faulting module name: bfgminer.exe, version: 0.0.0.0, time stamp: 0x515f07a4
Exception code: 0xc0000005
Fault offset: 0x000000000000bf96
Faulting process id: 0x1b28
Faulting application start time: 0x01ce3647d3d57e57
Faulting application path: (removed)\bfgminer.exe
Faulting module path: (removed)\bfgminer.exe

Machine #2

Faulting application name: bfgminer.exe, version: 0.0.0.0, time stamp: 0x515f07a4 (2013-04-11 17:22:45.000000000Z
Faulting module name: bfgminer.exe, version: 0.0.0.0, time stamp: 0x515f07a4
Exception code: 0xc0000005
Fault offset: 0x000000000000bf96
Faulting process id: 0x264
Faulting application start time: 0x01ce35ec278316ab
Faulting application path: (removed)\bfgminer.exe
Faulting module path: (removed)\bfgminer.exe

Model path names contain identifying information so I removed those details.