I'm using Opera (Opera USB 9.64, to be precise), and all content is enabled for Renderosity. However I have had occasional glitches in other areas which suggests my browser isn't as perrfect as I would like to think - I wasn't trying to suggest it was Renderosity's fault, by the way. Everything else is, but not this. :) 

By the way, before the recent Opera updates which fixed a load of JavaScript related problems, the fancy editor didn't show up at all for me, and I was free to type HTML in directly. I could probably switch it off again and go back to that if I wanted.