> Usually I check off all 3 of the pre-defined groups
> in the UI and add +*.pdf
> 
> I've also done the default and had the same result
> both ways.


I can't seem to reproduce the issue (I'm getting <http://upload.wikimedia.org/>
as an external link)

Could you post the first line of your doit.log file in the hts-cache directory
? (this is the actual commandline sent to the engine)