Won't load past splash screen after launching a level/map (+missing themes)

Good Evening

I've clocked almost 200 hours on WFTO and today I've gone to play and it now will not load any level.

Campaign, Skirmish, Sandbox, Pet Dungeon or one from the workshop.

The splash screen loads. The bar fills 3/4 of the way and then a boom sound constantly repeats itself. The text at the bottom of the screen still changes but thats it. It won't load into the level no matter how long I leave it (its been sat for 30 minutes)

I've uninstalled and reinstalled it. Tried again. I've then uninstalled it and deleted everything I could find and cleared it from my Reg. Reinstalled it and issue still persists.

The bar progresses to 75% as normal then flashes back to 50% and loads back to 75% and stops.

This seems to have occurred since the announcement for 1.6.3f1 but this is only to do with mac OSX from reading and I'm running windows 7 ultimate SP1 64 bit (my computer has never had issues running it in the near 200 hours already played on it, except for a bit of lag on level 12 of the campaign)

I've also now noticed when trying to launch a map in sandbox mode not all the types (sovereign, rhaskos etc) are listed. In fact they are all missing but the normal one and Sovereign. both campaigns and pet dungeon are completed so I should have all of them.

Really frustrated as this is my go to game and I can't figure out why this is occurring.