This is the second time this has happened.

I have spent quite a while creating a post. I thought about something to add, clicked the cursor where I wanted it, started typing and suddenly realised that everything I had already typed had gone! When I clicked the cursor, somehow it must have selected the whole lot and deleted it as I started typing - I wouldn't mind, but the UNDO button isn't working and I couldn't get it back.

I do find it to be pretty unstable at times. Often I will click at the beginning of the row I want to type in and suddenly find my typing is coming out somewhere else and the cursor is several rows higher than where I put it!

What is going on? I am using Mozilla Firefox. Can't see why that should make any difference - I use it because I prefer it to IE.