tune up not working with itunes 12

I've been using tune up version 2.4 without issue for months but since I upgraded to iTunes 12 yesterday, it keeps saying that my songs are "an unsupported format and can't be processed" whenever I try to 'clean' them. All my tracks are MP3s and it doesn't work with tracks that I had previously cleaned through them. Is there a fix for this? I did see on their website that they don't support the beta version of iTunes 12 but that obviously shouldn't apply now.

Any help would be greatly appreciated!