I am having the same problem. Given the choice of mods to add to Civ 5, vanilla is boring. Please help, I would love to play with some of these mods. I have gotten several mods to work fine & get the game to go, but I want to try more.
I am trying to currently run:
Medmod VI (v6)
Nazi add-on
Hitler (leaderhead)
WW2 Carriers
I had added these mods & the game broke.
Also running:
Balance - Fewer Poor Policies (v1)
Epic Speed Tech (v1)
Extra City States (v6)
Military Training Re balance (v1)
R.E.D. modpack (v10)
Units - No Nukes (v2)
Not Another City States Mod (v11)
Terra Nostra (v5) - for the extra civs.
I have had very few problems running just those mods. When I added the above 4 mods (dropping out the Epic Speed Tech mod to avoid conflicts with Medmod). Even dropping out all of the "Break mods", verifying the game files, and swapping to Steam offline; the game will now crash on the Load scenario screen.