I haven’t used SYSTM for a few weeks. A few days ago I went back to the software. It turned out that I have, among others out of date credit card details so I updated it, but the software was also updated to 7.13.1. It all coincided with a server crash. Since then, I have had a problem on my Windows 8.1 computer playing training videos. When PLAY is turned on, the program turns off. Workouts without video work fine.
Since I still have The Sufferfest app and the SYSTM training plan also appears in it, I can run the same workouts via The Sufferfest. Everything works fine here.