Hello, 

thanks for your awnser, Im on Windows 10:

if I use slideshow mode for the wallpaper and reboot my computer, I get the following error message: 

if I try to reactivate Fences it doesn't work, the same message appears. 

Once I change my wallpaper to a single image, without slideshow, and reactivate Fences, I no longer get the message and everything works.

Thanks 

Damien 

I can  not reproduce your issue on my Windows 10 system. Please try purge and reinstall steps as mention here : [Link]. Just make sure to redownload the latest version from your account page. Reboot after the purge. Reinstall and reboot again after the installation. Retest and report back here.

Thank you,
Basj,
Stardock Community Assistant.

Please try cleanboot: https://forums.stardock.com/486084/fences-support-faq#cleanboot. Try that and report back.

Thank you,

Basj,
Stardock Community Assistant