I'm at work behind a difficult web filter, so I can't see the image you posted.
Ha - yeah I know all about that 
Thanks for the tip - I am using Eagle - I just tried the SparkFun cam file which did not produce the extra bits on the silk - so a bit of further poking revealed these were in the bDocu layer.. There was something else on the bottom silk I missed - some polarity indicators that I added to bDocu myself, which is why it was turned on.
I've moved them up to bPlace and all is well. Lesson learned - thanks for the help!
(Incidentally, the sparkfun cam doesn't seem to use the bCream layer at all..)