Presto never ceases to amaze on glitches.
When using my Presto to connect from the Lakeshore line at Union on to Union Express, been charged two fares, and the UPX one, even when using the regular GO Presto machines, has been full adult, senior discount not being applied, even though card set-up that way. Just got off phone to flustered GO service rep, he completely sees the problem, but patience is wearing thin for GO staff dealing with endless glitches that shouldn't be happening.
Latest advice is to *not tap on, tap off* when changing trains. That in itself glitches, as I've found out the hard way, when one leg of the trip is over fifteen minutes late. The on-line application for refund refuses to accept a trip from point A to point B unless each leg is tapped off, next one on.
There's another glitch as well being addressed too. The UPX regular GO Presto machines show a fault when tapping on after tapping off of another train in quick succession. Again, the work-around is to not tap-on, tap-off on each leg, the algorithms are still buggy.
If one leg is late, get refund by talking to real staff at GO, not using the on-line application.
Oh Lordy, Lordy, Lordy...