I had an app running happily for over an hour, fetching realtime quotes for foreign currencies, when it suddenly encountered "a serious problem" i.e. a crash, and had to close. This is the error message from the command line: err:header:HEADER_WindowProc unknown msg 1264 wp=33f988 lp=0033f9e4 AFAIK there was nothing special happening at the time, and I wasn't doing anything to the program. Any ideas what happened?