Hi,
I'll add that when something works for one person and not another, the cause tends to be associated with Stored Settings. So when you have found a particular set of actions that you can reproduce over and over for 1 user that cause the GDC to crash, when you restart the GDC, disable the stored settings, and see if it still crashes.
This will typically explain why it will crash for one person and not the other. It may explain why it crashes when looking at one invoice and not the other. You may find that one invoice displays more than a screen full of info and the other doesn't, or the first row of the invoice in the display array is visible when the stored settings sort order is taken into account, whilst for the invoice that crashed you may find that the first row isn't visible using the stored settngs sort order.
Also even though it is the GDC crashing, it maybe crashing because of what the FGL sent it. So when you can reproduce the problem at will, not only test with the latest GDC to see if it has been fixed, but also test with the latest FGL.
The key thing is to get a small test case that reproduces the problem.
Reuben