I am setting up membership to protect content on a specific

I am setting up membership to protect content on a specific page, when membership is activated that page often will not load - it just displays as a completely blank browser page. (Sometimes it load in some browsers and not in others- and that's not a constant - i.e. it will load in safari but not in firefox or vice-versa).

As this is the page ppl are registering to see, and as I'm ready to start doing press for this project - I need a fix!

Thanks!