After I released the new TSNotifier version (1.6.0b/c) I got reports that some games (namely Arma 3 and Planetsite 2) don’t show the overlay anymore. It seems both of these games are using the anti-cheat software BattlEye which is blocking TSNotifer.
From what I found out about that software, they’re using a whitelist that contains all the 3rd-party software that is allowed and anything that isn’t on that list is blocked. They are also checking if the 3rd-party software has been changed in any way and are blocking newer versions until they are also whitelisted.
While this text talks about BattlEye specifically the same issue could arise with any anti-cheat tool. But in the end this is not a problem that I can solve unless I stop releasing new versions of TSNotifier.
All you can do is wait until the BattlEye-whitelist is updated to include the new TSNotifier version (and maybe inform them of the issue, that could make things go faster).