Try this first...
1. Turn off the game.
2. Delete the "Civ5ModsDatabase.db" from "Documents\My Games\Sid Meier's Civilization 5\cache."
3. Launch the game and go to the mod section again.
.Where is this button. Is this in the menu when you start the game, because this method has never worked for me then."get mods" button
This seems to be a pretty old thread, though I've just noticed this problem. All 'recent' mods aren't visible and when I subscribe to new mods nothing happens.
Tried all advice above. Any suggestions?
Cheers
Edit: It appears switching between offline online mode did the trick. I'm now back in buisness.
Thanks!