I just pushed version 2.0.2 live. It is an update to the Chrome extension and the App Engine server. Basically, it fixes the bug wherein links would open multiple times. I ended up switching away from storing the last link received's ID in the Chrome extension and then simply telling the server to send every link sent after that to have the Chrome extension send the server a message every time it receives a link, confirming that it did receive the link, and then storing that information on the server. Therefore, you should never see a link twice.
I apologise for all the recent problems we've been having. I know there's one other issue that can occur if you type a link into the Android app manually (the Page Not Found error), but it's 2:30 in the morning here, and I need sleep. So I'll be fixing that one soon. In the meantime, just use the Share button to send links, or make sure you include http:// when typing in links.