Weird.... Probably talk with Kendle or those guys in the Tech Forums?? I mean, after all, Doug and Jen play on the same server all the time..
Guess you're not running the same steam account because you both used to be able to play at the same time correct? Do
Start>Run>cmd
ipconfig /release
ipconfig /flushdns
ipconfig /renew
Then unplug you're router, plug it back in. Unplug you're modem, plug it back in. Restart the router again.
If all this doesnt work call you're ISP please post back to tell me if it worked
I'm pretty sure two of you using the same IP can't enter a server at the same time
That's correct as far as I know.