Wikimedia Bugzilla is closed!

The current upload code will occasionally decide to upload a file to
$wgUploadPath/a/ad/filename.png - the "/ad/" in that path will trigger some
simple advertising blockers, leaving some users unable to see the image (or even
Media: links to it). This could rather easily be fixed by testing if the path
chosen is /a/ad/ and returning another path instead, perhaps just /a/d/ or
something similar... though it would have to be changed in several places, I see
it 4 times in Image.php alone...

Admittedly, fixing this would break most existing MediaWiki installations, as
all the images in the /a/ad/ dir will have to be moved (probably by hand) to
wherever the fixed upload code says they should belong... I suppose it's one for
the powers that be to decide if it should be fixed.