Adobe LIghtroom 3.2 won't export files

Hello,

I've been using the latest version of lightroom for a while now and recently it has been refusing to export my photos. I'll go to the export screen, set the file type and what not, then hit export. It proceeds to get stuck. In the top right corner it says Exporting... but the bar never loads. As a work around I've been opening the photos in photoshop and exporting from there but thats a big pain. Any ideas on how to fix this?