Angel Learning platform problems

I teach on-line college classes. We use Angel Learning as the platform. In developing a course, I was going along fine on my iMac until about 2 weeks ago. Angel supports Firefox (but not Safari). Now, there are all types of problems as I try to post information on the webpages. Pop-up blocker has their website as an "allowed" site, and Angel says they support the latest versions of Firefox. Anyone have experience with Angel Learning and using a Mac? (www.angellearning.com) I'm about ready to give this MAC to my son and go back to a Dell!