Can't log in to last.fm (time zone issue?)

For some reason I can scrobble from WMP but not from my squeezeboxes.

I removed the account from the advanced settings in the server and now, when I try to reapply it, I get:

...There was an error verifying your account with Last.fm. Please try again later. (Unable to handshake with Last.fm because your system clock is incorrect. Please update your clock and try again.)..

Have checked system date and tried two timezones on last.fm web profile page (Europe/London and UTC).

Anybody able to help?

Mark.

(As an aside, anybody make much use of the £3 premium service - I'm tempted to give it a shot...)