I just thought i'd report my findings... after running the latest version of ccleaner anytime I download with mozilla firefox the download goes as planned but you cannot find the download!
I searched thru all the profiles on my win XP machine, it says it's downloading to a desktop, thats where I told it to. but it isn't there! even if you do a duplicate download it names it version (2) so it don't overwrite the prior dl.
I was using ff 18.104.22.168. I installed ff22.214.171.124 and probl;em is gone.