>All of this would be much easier to figure out if I could actually run the COM server under the VFP debugger, but that is not possible without a great deal of effort.

Jim - I'm a big believer that every VFP COM Server needs a LogIt (or AddToLog or ...) method that writes out whatever you pass it to a text file. Set up the log in the server's Init method, storing the filename in a property. Then, it only takes one line to add some debugging code anywhere in the object:

This.LogIt("Starting blah blah blah. Variable xyz = " + m.xyz)

You can also instantiate VFP objects defined as COM servers natively in VFP for testing. It's not complete testing, but it can save you a lot of work up front as you weed out the typos and other simple errors.

Tamar