This catches some people sometimes - see the plus I have highlighted? If you click it, it expands the forums back. Try it - it will be a minus now, click and you get that contracted view and it turns into a plus. Click again, back to normal.

ahaha i bet that was the bloody problem too, i just clocked that after you said it and the forum went back to how it was before i deleted temp internet files clicked again and bingo its big. and it must save that to my preferences on forum viewing in my account so iff i log in from any where it keeps that setting, cos now on all the devices it shows it back to normal,even the stupid iphone wow to think it was that simple and i was about to see if a smart phone could fly as i had no idea how to clear the cache on that thing.