All DLCs are installed and enabled in steam. Additionally, when I start the game sometimes I am able to load my DLC games just fine if I rush to the load menu and load it without delay, but if I delay a while the game will disallow me from loading my game. This is not a consistent thing. Most times I am completely unable to load my game no matter how fast I try to load it (by rushing to the load menu from the game loading).

I have tried verifying the local game files, and there is usually one file that needs to be redownloaded.

I have uninstalled and reinstalled the game and deleted the steam files multiple times.

This is a very strange and inconsistent problem. And not one I've encountered before until I got the latest DLC. 

Not an old save. Same current version. And the problem is not just with the save game. It's also with starting new games, as I outlined in my OP

Nope. Single player only

New player here, been having allot of trouble with this game and I cannot find similar people with the same problem so I put it to you internet experts.

Started a new game, thus far i have had 4-5 crashes all of them saying game files corrupt please verify install to fix this.

Problem is i have done this many times, verified, shut down steam then verified Shut down Pc then verified, changed download region the works. Nothing is fixing these crashes.

Finally now i cannot even access my save as when i try to load it it says:

"The following downloadable content is required to load this saved game: LEGACY OF THE ANCIENTS"

Problem is, i have this DLC and it is installed, and once again I verified and restarted. Nothing. Anyone heard/had of similar problems and any tips you can give would be appreciated...

Same issue here.

Just revisited Sins after awhile, saved a game with three AI's and came back a few minutes later to an error saying I needed the DLC to play the save file when I didn't change my game in the minutes between playing it. Very frustrating