Please see bug report 1725 - http://bit.ly/anxAiC
Apparently, you cannot geotag tweets anymore when a user's account is configured to any non-English language. My client users started to report this error a couple of days ago. When they switch back to English ("lang" = "en"), everything's fine again and they can geo-tag their tweets. ole @ mobileways.de / @janole on Twitter / Symbian S60 Twitter client #Gravity