I do not have virtual radar, Notam or Flight Details panels in my PC version of SkyDemon. The iPad and iPhone versions are fine. I have version 3.4.4.0. Maybe I got rid of them accidentally somehow, but I cannot see how to get them back.

Perhaps your settings have become corrupted.
You can launch SkyDemon with the /resetsettings command-line switch to reset all settings.
If you're not able to do this you could delete the settings file before starting SkyDemon. It's located in the folder below and is called settings.xml.

C:\Users\Name\AppData\Roaming\Divelements Limited\SkyDemon Plan

The resetsettings option did not work, but deleting settings.xml fixed it. Thanks.