Thunderbird - Printing to File

When I try to Print to File messages in Thunderbird (official release, 1.5.07, or the latest daily v2 beta) all I get in the output file is 'garbage' in the form of the print control and type of font characters- no text at all. (The printer is a Lexmark 4039 12R Plus and is using cups and printing to this is not a problem.) Anyone, please, have any ideas if this is a bug in TB or is Print to File somehow being sabotaged by cups or something else I am not aware of? Cheers. -- "If the terrier and the bariffs are torn down, this economy will grow." George W. Bush January 2000