Starting from the main menu, I click Multiplayer, then click Gamespy, at which point the program stops doing anything (music keeps playing and I can move the mouse around, but the menu elements have stopped moving and mouse clicks result in nothing). Alt-tabbing brings up a dialog box that had popped up in the background (see attached image). This same error occurs whether or not the registry is using the "default" CD key or the unique key I requested from GOG.
Anyone else have anything like this? The rest of the game is running fine for me currently so it's a bit odd to see this problem here.

I found a rather odd workaround -- if I disconnect my internet connection before selecting Gamespy multiplayer, the login screen will come up as normal. I can then type in a login (didn't try my actual gamespy account, just did the "log in anonymously" option), alt-tab, reconnect to the internet, go back to Dragonshard and log in normally. Bit weird but it works, just in case anyone else has a problem like this.

(No one's in the lobby, of course... too bad.)