I realise that this might sound trite but have you tried turning it off and on again? I mean holding the top left button until you get the menu options of 'Sleep', Set Bike Alarm' and 'Power Off' (and powering off). I had a problem with my 530 not changing to BST; I tried several things suggested on Garmin help pages, forums etc. - mostly on the line of plugging into PC, checking for updates and also rewriting system files. After loads of plugging in, resyncs, firmware checks but before getting ready to rewrite system files, I came across a post suggesting the power off and on - which I thought I had already done - but I was merely putting it in and out of sleep mode. It did the trick for me.
That's one of the things I've found annoying with the 530 interface, the button functions being unintuitive, and the on/off button default options.