So far what we do know is that it is happening with C# or Jscript and Infopath 2003 and Infopath 2007. I wonder if it could be a bug?
A work around is to is to use the "Add Record" Hyperlink in the corner of the table. This seems to work ok.
Rico, do you have a master/detail query?
I am using master/detail.
Thanks
Mark