A lot of people have had that problem with Vixen. I had it one year, but for other years it worked fine. While I don't know the solution, a lot of people use xlights for their scheduler because they also could not find a solution. That's what I did the one year I had problems with Vixen's Scheduler. This year I am only using xlights, since i have added a few smart stirngs. You might have beer luck for a solution searching through the posts in the vixen forum on DIYC.