Thanks sportznut.
Yes, it may have been your outside barrier system. I've had a look at some of the many postings on that system. I can't quite get my head around it as yet. I think I'll print out all the pages one day soon and then have a good look at it and then perhaps have a go at using it. Perhaps within a couple of weeks.
For the timebeing, I'll keep an eye on michaelg's postings. His Unitab system's starting to fail a bit but, like all systems, I think that it will have a good run again.
Today I had only one bet because I had to get back to work on my courier run. I chose the only winner, "The Name's Bond", fortunately, because it was chosen by both the Unitab and Tabcorp systems, plus the fact that it was a 6 pointer, and the fact that it won it's previous race by 5 lengths. I was a bit worried, though, when I listened to the race whilst I was driving around on my courier run because the horse stayed at the back of the field for most of the race.