>Dave at CodeMine also emailed me back this morning, and suggested I look at the cListExpression in the ListNavigator for "unusual" stuff (my specialty by the way).

Well Mel, you do have a habit of fighting the framework <s>.

>I deleted the ListNavigator completely just to see if that helped, and can't get it to crash at all at this point. So... its looking like the ListNavigator is the problem - so I will rebuild that early this coming week.

So it was the "interface", at least, a part of it. I would be interested to know how you have abused the ListNavigator on this occasion (just before you ship your app) <g>.

Best