DRM , this is what I've sussed :
I was getting regular asset checks of between 15,000 and 19,000 objects , This was taking upwards of 7 hours to complete .
I could make alterations to content in CMP , I could download content as well , But every time I did this it would add another couple of hundred or sometimes even a 1000+ items on to the list of assets that need to be checked !!
I have also witnessed on a regular basis that the list whittles down to a few hundred and then suddenly adds on another couple of thousand without me doing anything in CMP !!
Whilst these checks are running it's no good attempting to run the main program , It will eventually run after starring at the loco for many minutes but any attempt to start up a route results in a blank screen up until the asset check has finished .
I have since worked out what my problem is : I have installed as DRM , S&C , Duchess , Coronation and Pro Train Perfect2 .
It's Pro train perfect2 that adding on the huge amount of extra files that are checked on a regular basis . (For those that don't know , Pro Train Perfect 2 is a German content only version of Trainz 2010 with custom German routes and content) . I had a major problem in that TS12 plus service pack 1 wouldn't accept my Serial number even though its a legitimate purchase and it had worked in TS12 pre sp1 . N3V has since added the ability to use this add-on with 12 but now it comes at a cost of a 7 hour asset check
This info then brings up the possibility that a similar situation may be happening to those who have installed the 2010 .ja files into TS12 , Unless someone can advise that it doesn't .
In my situation I have after a suggestion from Fudginator split up my content collection into 2 installations of TS12 . Install 1 has all my original Europe and rest of world content including the DRM plus Pro train perfect 2 , My new second install contains only UK and Ireland content plus DRM but no Pro train perfect 2 .
I've not experienced how long the first install takes with an asset check as I've not really run it much since the split , But the second install now takes just over an hour to run the check . It's still 60 minutes too long in my book but I can always find something else to do for an hour . Though it always seems to happen when I'm pushed for time or whilst I'm trying to check new or repaired content in the sim .