I am experiencing the same problem. Steps to reproduce (works each time on my computer) :
- Load the Final Frontier mod
- Select Solo, Custom game (Partie personnalisée in French)
- Modify at least one team assignment so that there is at least one two-player team.
However, setting up a custom game without a two-player (AI or human players) team seems not to trigger this bug. I tried
- checking the "No barbarians" options
- closing a player slot (10 civilizations instead of 11 on the map)
- switching team assignments (player in slot 10 being team 11 and player in slot 11 being team 10)
In all of these cases, the game successfully initialized.
When this bug is triggered, the game "hangs" on the initialization screen, the progress bar remaining at the first stage (labeled "Initialisation" in French). The system monitor shows a >90% processor usage for BtS process (even after several minutes), but the memory usage remains stable.
When this bug is triggered while in full screen mode, I am not able to minimize BtS window, and the system monitor window appears under BtS window, if it appears at all (I have to reset my computer).
While in windowed mode, the system monitor window appears above the BtS window. Also, if I move the mouse cursor above BtS window's minimize-maximize-close buttons, they do not respond to click and do not even get highlighted.
In every case, the music still plays fine.