I was recording something and called up the custom tags dialog from the "Edit Album Details" dialog.
I deleted a few of the standard entries I normally have set, then added four new entries, closed the custom tags dialog and got the error.
Thanks Steve, I'll take a look. Pinpoint-accurate problem reporting as usual, it really does help.
Three more things about this:
This is something I do a lot, adding custom tags during a recording so I suspect this is an exceptional exception.
The VS instance wasn't fresh, recordings had been done earlier and the pc hibernated several times.
When I restarted VS post crash the custom tags dialog was blank.
OK, thanks. Sounds more complicated to diagnose than I first thought :(