Upload Library & PSDs

[eluser]danphilibin[/eluser]
I'm having trouble uploading PSDs with the upload library. GIFs, JPEGs, PNGs, and ZIPs all work fine, but the PSD won't upload. I've searched through the forums, talked to a few other developers, and played around with it for hours, but alas, it still won't work.

Here is my upload function: http://pastie.org/268475

And here is the form that's being used: http://pastie.org/268477

I'm pretty sure it isn't a problem with the mime types, as previously noted in the forums, but maybe I'm wrong - that type of thing isn't my specialty.

Thanks.

-dan