It has been quite frustrating but it wasn't until we ended up with carnage a few days ago I decided to try and do something about it.
I usually sit in the driving position with the select and my lad goes into the middle with the Elite. We usually get four trains running on two lines. They are kept apart by the signalling (48 track circuits controlling signals, each with an abc section). The system froze up and we closed the program. The last point that had been called operated as the program closed causing a train to be diverted into one of the return loops. There was a rear end collision with a very heavy class 66 ploughing right through a train of mineral wagons, some of which made it to the floor. Though it wasn't my lads fault he was quite upset. Time to sort it.
I am generally happy with the system and have had a number of successes with it. I am a bit of a technophobe to be honest. I build and test signalling systems for a living but computers baffle me.
Thanks again for the help.