one observation i made:

when i set the refresh interval to "15" min it changes nothing. but if i start surfing the web, the automatic refresh works..so it seems that it cannot build up an internet connection to refresh by itself, although the omweather app does this perfectly. however the blue notification light doesnt flash, the sms ringtone went off though...really weird..

update: couldnt reproduce that error again, if i surf the web it refreshes.

i deleted the gmail account and set it up again on the n900, didnt help, it seems that unlike omweather, it is unable to connect to the internet, refresh and close the internet connection again.