I loaded TS12 the other day after an absence, and on loading a session  where I had portals set up with AI trains, suddenly many of my trains  will not complete their routes.  They take odd paths and obstruct each  other were previously they didn't.  Some stop at track marks and won't  move unless I manually take them over, start and stop the unit, and tell  it to continue.  Build 61388
				
			 
	
 
 
		