Email'ed invoices/sales orders are blank...

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I recently upgraded to the latest sql-ledger and now have an issue with 
emailing invoices or sales orders...

If I select HTML and EMAIL I get an attached file of 7 bytes that only 
contains

<HEAD>

and terminates.... My templates display correctly when directed to screen. Is 
there something I need to change on my templates to have them work correctly 
with this new update?

Thanks,
Dave