Yes I did try clearing my cache etc. I've used FF, IE and Chrome on windows based machines. My main PC, my son's gamer PC, My Laptop, daughters laptop, son's laptop. Kindle and Nexus 7 also my Android Phone and i-pad 2. I've run FF in safe mode (no plug ins) and have turned off all of my anti malware software and AV. I'm trying to remember if I tried in safe mode or not, I may have to redo that.
Current firmware, after trying the initial one is v 1.02, the beta version.