The only problem I had was on lvl12, every other level I beat easily. I still don't know how to beat 12 though. I tried everything, letting my guys free, or making them follow me; attacking the bases first, or the enemies, or saving my own. None of them seem to work. Eventually after dying 10 seconds after the round started, I just covered my face and waited for the round to be over. When I looked back up at the screen, there were 4 blue bases. I guess I got lucky, or that is what you're suppost to do, sit there and do nothing. :D
The reason why some people are having this and some aren't is because it happens sometimes. It happened to me once, and then the popup went away, then it came back, then it went away again. I think what causes it to go away is if you play the game at the main website. I don't know what causes it to come back though. I think this is happening because the kong version needs to be updated, or kong and mochigames don't like each other.
m0rkeulv, let me explain the problem better than these... average kongregate users. Here is what happens: You click multiplayer and go to the screen. Then a little oval shaped popup apears at the bottom right. It says loading user, or server, or something, I can't remember the exact words, but that's not important. Once it finishes, it says mochigames and has a login button and a sign up button. If you ignore it and click either guest, player, or new account in the center, it shows the background and that's it. Since play a guest doesn't have a return to menu button, you can't go back and have to refresh. Back at the multiplayer screen, if you click back, it just goes to a black screen, and you have to refresh.