I have discovered a bug in the LLReg function that was introduced in Release 2.13 of the Real Statistics Resource Pack. If you will be using the FIML capabilities of the software, then you should upgrade to Release 2.13.1 where this bug has been fixed. This release is now available for free download for Excel 2007, 2010 and 2013 environments.
The updates to the website which reflect the new capabilities in Release 2.13 (and 2.13.1) have almost been completed. If you go to the Handling Missing Data menu item on the Basic menu you will have access to explanations of most of the new capabilities.
Charles