Hi-
I can think of two things to try:
1. If you can send me your form, I'll take a look, publish it on one of our SharePoint servers, and test it out. Send the XSN to support at qdabra dot com
2. Would you be able to add custom code to a blank, new form, and then publish that (via sandbox)? If that form with code (non-qRules) cannot be deployed, then it's most likely an issue with SharePoint and not qRules.
Let me know which one you'd like to try.
Thanks.