Hi Nate
No it's definitely not that, but thanks anyway. You know when you copy an image outwith Photoshop and then come to File > New and it knows what size it is so you can paste it in? (Well that's what my previous versions always did). It just doesn't change from a default in CS.
Stop Press! Cancel the above! Just went to check again and all is OK. Maybe re-booting did the trick (yes, I know I should have tried that first, but I have been having this problem for a couple of days and re-booting didn't solve it.) BTW I've also changed my Zone Alarm settings to let CS access the internet - could that have been a problem?
Sorry all anyway, but thank goodness it's fixed.
Cheers!