Can't download PDF files!!

I know the last update included a security update. Suddenly I'm not able to download any PDF files for my classes. I get the window with the option to open or save to disk, but the OK button is greyed out and I can't get the file!!

If anyone can tell me how to get past this, I would be very grateful!!

Try option clicking the file and see if it automatically downloads.

Huh, it's working now. That's the strangest thing. Maybe there's some kind of security on the school's network (I'm home now). Funny, considering I'm trying to download their files.