Fences program keeps disappearing

I downloaded Fences, paid for it, installed it, configured my fences.  All works well.  Then, the next morning, the fences are gone, the icons are in loose groups on the screen.  The fences icon is on the screen.  I click on it and it allows me to configure Fences, but says the program needs to be reinstalled.  It doesn't stay on the system, except it allows me the configuration panel.  I go to the site, download Fences again, activate it with my code, and all the fences reappear with the correct icons in each fence.  This has happened 3 days in a row.  What am I doing wrong?  Any help appreciated.  Thank you for your time.