Just as a quick test, what happens when you press alt shift at the same time? Does it fix the mappings?
Brilliant - that cleared it straight away thanks.
Would recommend this little beauty (Asus 1005HA) to anyone working on the move and on a budet. 8 hours battery life, W7, 1GB RAM, 240GB hard drive, bright 10" screen, good build quality & stylish for £249 ! (Amazon).