I didn't post this in the applications forum since this seems to be an issue specific to the Eris. I hope that's alright. Using Seesmic 1.2 but I had the same problem with 1.1. I have Background Notification checked, Vibrate, Ringtone and Flashing LED unchecked. Even though I have it unchecked the LED starts flashing whenever a new tweet arrives. I would just like to have the notification in the status bar and no other form of notification. My friend has a Motorola Droid and doesn't have this issue at all which makes me think it's only on the Eris. I tried contacting support and they weren't able to solve the problem. Google doesn't turn up any similar issues either. I'm hoping a fellow Eris owner and Seesmic user could chime in and let me know if they experience the same behavior. At least let me know that I'm not crazy and tell me this happens to other people.