Oh, _there_!...
It was Fra who pointed me in the direction of the Java update in the first place, pointing to that very thread.
So, then, this issue here is nothing to do with my Java update. In any case, I think it may have been a case of my Mac needing a restart. Now, it only sends a checksum file together with the .pdf files, but no scratch files.
Thanks for the posts all the same, Djordje!
Alex Zachopoulos
MacBook Pro 17" 2.4GHz, MacOS X 10.5.6, ArchiCAD 11 & 12, WinXP, Vista (well, not really Vista...)