What happened to my shortcuts?

There seems to have been a nasty update. All my desktop icons have disappeared, a right click on the background does nothing, minimize and resize have disappeared from the top right of Firefox and the start menu has gone screwy. Has anyone else come across this little gem in the last day or two and, even more important, what's the fix for it?
Thanks.

SImon.

Post a screenshot please, so we can fully visualize what you just said.

Here ya go, one Screenshot

Notice no resizing buttons in Firefox.

TABLET MODE! It had set it into tablet mode! ARGH!
All fixed now, just switch tablet mode off.

@SimonH:
You're in 'Tablet Mod......, uh...... there you go!!!