I get this too. When I check the messages again, the number goes away. Down the road it comes back.
Remember this is a beta. You may have to deal with it for awhile. New version is out today though, maybe its better?
Oh no! I had an earlier version of Seesmic on my Tour and it said I had 99+ unread tweets even though I marked all tweets as read. I'm gonna have to take a look into this.
I have the newest version. How do I get my location to update? I have used ubertwitter in the past and it would add my gps coordinates to my Twitter web page. Am i missing something? I see the allow gps location and that is checked and i also clicked the gps location button and it did pull my address.. and did nothing with it.