Editor crash on startup after upgrading to 4.6

I’ve posted this on the answerhub too, but I’m getting a little desperate at this point!

After upgrading to the latest version of the engine, and updating various compiler errors, I have arrived at the stage where the editor crashes on startup and I cannot figure out why. I’ve posted some pictures on the answer hub along with the full details:

I’m wondering if it has anything to do with the TMap, has that changed in the latest engine version?

Any help would be greatly appreciated: it’s getting quite frustrating at this point as debugging seems to take me nowhere