A recent AVG and Avast antivirus update is preventing DisplayFusion 9.9 from launching on some systems. If you're running into this issue, please update to the latest DisplayFusion 10.0 Beta.
I can see only the Network, Volume, and Clock on the taskbar on my second montior. Whenever the microphone is in use, that icon also shows up, though it shows up "incorrectly". However, all of the other icons for programs that are running (Outlook, Discord, Slack, etc.) don't show up on the second monitor at all.
Monitor 1: https://i.imgur.com/qkICUqJ.png
We've got this issue open on our list. The latest builds of Windows seem to have done something with the system tray so DF can't read it now. I've added your info to the open ticket and we'll be sure to let you know when it's all fixed up.
This issue should be fixed up in the latest beta, available here: https://www.displayfusion.com/Download/Beta. Please let me know if you still run into any trouble after updating.