Error: undefined; offending command; stack

Just recently, whenever I try to create a multiple-page PDF (eg. from a Word 2007 document), it does the first page, and then a blank second page which says:

 

ERROR: undefined
OFFENDING COMMAND: H’R×jF’oÆ
STACK:

 

I tried this using the latest version (1.1.0) and its immediate predecessor; both the same. I'm on a Windows 7 64-bit Dell laptop: any advice? This is driving me insane!

Anyone?