I'm having 2 issues with the online multiplayer. The first is that I can't get a player on my LAN and Online to both join a lobby at the same time. I can only get 1 or the other.

The second issue is that if I start a match with another player online the game never starts. It just says, "game starting..." but it never starts. I can start a match fine if its just on the LAN.

I'm not sure if the game was designed to be able to handle a mix of local and online players...

For the online problem, does it matter who hosts the game?
Do you have a firewall active that could be blocking access, or anything?

You can email supportdc@larian.com, with a description of the problem and the report.zip file generated by the Dragon Commander support tool, though they may be a little slower to respond that usual (depending how much email they have getting back from their Christmas break on Monday).