ntvdm.exe error with sbbsexec.dll

Hi DM,

Recently I moved my BBS to a Windows 7 (32-bit) VM, and occasionally I've noticed an error dialog showing up saying NTVDM.exe has stopped working. It seems to happen with certain DOS doors and not others - One I've been able to consistently reproduce it with is DCT User Chat, and it happens when exiting the door. I doubt many people use that door much, but I've occasionally seen some users run that on my BBS, and I'm wondering if this same error may be happening with some other DOS doors as well.

When exiting DCT User Chat, this information is shown in the NTVDM.exe error dialog:

Problem signature:
  Problem Event Name:APPCRASH
  Application Name:ntvdm.exe
  Application Version:6.1.7600.16385
  Application Timestamp:4a5bc158
  Fault Module Name:sbbsexec.dll_unloaded
  Fault Module Version:0.0.0.0
  Fault Module Timestamp:4ede8149
  Exception Code:c0000005
  Exception Offset:10005576
  OS Version:6.1.7601.2.1.0.256.1
  Locale ID:1033
  Additional Information 1:0a9e
  Additional Information 2:0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:0a9e
  Additional Information 4:0a9e372d3b4ad19135b953a78882e789

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