Firefox Nightly Build 8.01a Doesn't Access Attatchment links properly

I'm not sure if anyone else uses the Nightly build of Firefox, but I've noticed that lately whenever I click a forum attachment to download it, it attempts to open an index.php file which contains a lot of gibberish.

i find myself having to copy the link address and paste it into chrome to download the file.

Anyone else have this problem, or know how to fix it?