[Zope] Problem refreshing a python product

I'm back :) I'm having a problem with Zope not refreshing my python products. I have a broken product that I'm writing and I can't convince zope to refresh and reread the product code. I've tried restarting, shutting down and starting again, and the Refresh product. I've deleted .pyc files and it still shows the same traceback. The traceback still shows a line of code that I've removed from the product. At this point, I'll try almost anything. TIA, Troy