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Reverted to 5.4 and the issue appears to have stopped.
I think I see what's happening. I have seconds enabled on the taskbar clock, and I can see the seconds portion disappearing and reappearing every 2-25 seconds. The main process or service for 7TT is wigging out hard for some reason...
Customer support service by UserEcho
No problem. Love the program! Thanks for all your hard work!