I would like to be added to the list as well.  Below is the reject information from my returns.  None of my clients are trying to claim a LP fuel credit.  I tried to put zeros on those lines to see if the return would be accepted, but that didn't work either.  There are no errors on the Form 4136 when running Final Review.

Return Rejected by Taxing Authority

Error/Return/ReturnData/IRS4136/NontxLiquefiedPetroleumGasGrp/CreditRT: Data in the return is missing or invalid. Please double check your entries.

Review entries on Form 4136, Credit for Federal Tax Paid on Fuels, correct all errors. On each row, if an entry has been made in any column, review all columns to ensure that the row has been properly completed.  Make the appropriate change(s) and re-submit this return for electronic filing. If the reject continues, you will need to print this return and file by mail.