Hi, and thanks for your interest in DBXL.
DBXL hasn't been tested (yet) with InfoPath 2013, so we would recommend using InfoPath 2010.
I have seen issues on some machines where having two versions of InfoPath (e.g. InfoPath 2007 and InfoPath 2010) causes bizarre issues. You might be in one of those scenarios now, with both InfoPath 2013 and 2010 on the same machine. Uninstalling InfoPath 2013 for now might be the solution.
Hope this helps!