I'm running TMG V9 on Windows 7 (64-bit) and am adding witnesses to a Census Tag when I'm presented with a pop-up saying "Operator/operand type mismatch 6222 GROLESEN4". I've already input two census tags since I started with V9 - no problems. In fact the previous Tag had the same witnesses. These witnesses are new (they were not in V8). The Tags have been used for ages and I have not changed them.
So - I open the Tag (Census 1871), fill in a few fields and then add a witness. It is when adding the second witness that the pop-up occurs. I try the three options on the pop-up - skip, retry, cancel - to no avail - the application is frozen and I need to use the Task manager to kill the application. I have tried VFI and optimise followed by a reboot - all to no avail.
I've been using TMG for a while (I think from V6) and rarely find errors.