I'm having the exact same problem as this, already tried SE support and they just suggested stuff I've already done. I've reset my internet options and reinstalled .NET framework 4.5, also tried reinstalling the game about 10 times. Not tried looking through the log but any idea where and what sort of warning I'd be looking for? Only other option I can see is formatting the pc but I could do that and it might make no difference for all I know.