Yes, if you're using a certain version of IE apparently there are problems. We strongly encourage you to upgrade to IE 8 or even better download Firefox (it's free). We hope Ning resolves this soon.
One of my friends & I both have been having problems. It worked fine before, now we can't change our page appearance. They no longer give an option for it. then my friend couldn't log on so I gave him a back way in. He was able to get on, not know how everything else is working for him, for me, well ok I reckon.