So in my first race in GTC I just had iRacing crash on me with the following details.
Problem signature:
  Problem Event Name:	APPCRASH
  Application Name:	iRacingSim64.exe
  Application Version:	2.6.1.6
  Application Timestamp:	51019423
  Fault Module Name:	DSOUND.dll
  Fault Module Version:	6.1.7600.16385
  Fault Module Timestamp:	4a5bdf19
  Exception Code:	c0000005
  Exception Offset:	000000000000af8e
  OS Version:	6.1.7601.2.1.0.256.48
  Locale ID:	1033
  Additional Information 1:	7fdf
  Additional Information 2:	7fdf256c57b6d6ab1833a7d3fae7c528
  Additional Information 3:	e365
  Additional Information 4:	e365fb30f8c645d447a65c0e68740a78
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Anyone familiar with this problem?  Its been fine all through week 13 with the same cars.