I've now gone back to a backed-up copy from late September, i.e. before TS2015. That doesn't load either - and it's smaller than its later cousins. Hmm...I absolutely take Gary's point that
Assets and contents aren't being revised though, the core of the game is the patched part so no matter what combination of assets and contents you use you'll get the same result.
Which should make my experience here impossible.
I'd be grateful for any thoughts any of you may have. It's worth saying that my 'England' data set is large: the Assets file is 169GB, the Content file is 26 GB, and 230 Routes are included. Has the patch reduced some key limit? What other characteristics of several different data sets, all previously acceptable to TS2015, could cause TS2015 to fail even before the first white (DTG logo) screen?
Think I'll take a few days off in the real world, and see what drifts into my mind...
KInd regards,
John M
PS And, yes, I took my own advice and ran an Error Check under Properties. No faults whatsoever, not even an Index error...
JM