Thanks Bill Yes mate I can't for the life of me think I did anything out of the ordinary while adjusting the colours
A system restore has sort of got it back though the font as I type are still a bit on the small side but not the end of the world.
The other suggestion actually flicks me between the reply window and the post window vis a vis your reply and my Submit Reply window - scroll back to the reply and forward to your response.
Only thing is if you do that you need to copy your reply before you flick back to what you are answering. Is going to be a handy feature as I am always wanting to check something (like system specs) in the incoming while I type a response.