Okay, I am running Windows 7. I have TT set to minimize (it closes by scrolling down to the bottom of the screen) and place the task bar behind open programs so that it doesn't open when I run my mouse pointer to the bottom of the screen whenever a program is open.
I have mIRC (https://www.mirc.com/get.html free 30-day trial if you want to use it to reproduce the problem), which will minimize to the task tray (next to the clock) when I hold down SHIFT while minimizing it. The problem occurs when I double-click the mIRC icon in the task tray to maximize mIRC again. Once I do that, TT stops sending the task bar behind open programs, so that the task bar pops up whenever I run my mouse pointer to the bottom of the screen. The only way I can get TT to start hiding the task bar again is to exit TT and restart it.
I hope this makes the problem more clear. I'd make a video, but this old machine isn't up to the task.
Customer support service by UserEcho
That's okay. I don't often run mIRC in the task tray, but thought I'd mention it to you in case you wanted to know of the issue.