I have also lost the ability to create new fences. I tried reinstalling numerous times, no change in ability. I even have a new laptop, reinstalled programs, still unable to create new fences.
Sorry to hear you are having issues. Need more information on your system.
1) Windows version, please use Winver.exe for full Windows version numbers.
2) Fences version installed.
3) Have you tried uninstall and reinstall on Fences.
Stardock Community Assistant.