Haven't seen this commented so thought I'd say something.
As a group moderator, once in a while I want to change the group avatar. I thought that function was removed, couldn't do it. Then something - maybe an angel? - told me to try explorer, so I did and it worked.
Another function that does not work with the firefox browser is commenting on comments. I think it goes to a 2nd or 3rd level, but that's all. In Explorer, the commenting goes many more levels.
Just commenting in case others have issues in Firefox. I usually prefer Firefox due to Google's collecting information and selling it, and the adblock function in Firefox is good. But if something doesn't work, I go to Explorer and sometimes it works.
I suspect this is a Ning system compatibility issue, and doubt that it will change, but it might be handy info for other users.
Make sure you drop a note to Richard about this.
If you use Firefox and are afraid of Google Analytics, get the Google Analytics Opt-Out Browser Add On for Firefox. This is a handy extension as I think we are all being tracked enough. I agree also that different browsers have different functions.
Computers are funny. Wife has a Windows 7 laptop made by HP. She couldn't open a PDF with it, and I couldn't either. It was HP software that apparently they want you to buy. I erased it all and put on the free Adobe Acrobat Reader. Problem solved.