Classic British Flight Sim

If its freezing on all your browsers it sounds like it could be you AV?

It's only freezing on Firefox based browsers though and this is the only site that does, IE, Chrome, Opera, Safari etc are and fine. I'm using MSSE for AV so not one of the known problem packages. All browsers up to date.

I use MSSE too, and no issues with it. Definately a strange one

Don't really know enough to make technical comments, but just for the record, I am using the 64-bit version of PM (9.1-x64) on Win 7 Home Premium.
Previously I was using whatever 32-bit version it was on an XP3 box.
Intermittent fault + apparently random = red herring nightmare

Good luck with it.
MikeW

Edit: Edited for clarity; no idea what version my Win7 is.

FF is the only browser im using, and not have any probs!
Maybe you have virus or improper setting error?