I was using TC pro 15 under windows 7 with no problem. I upgraded to Windows 10 pro and reinstalled TC pro 15. After a few days out of the blue snaps were not working! I went to Windows settings and changed the Display resolution to 1366x768 and then back to 1360x768. Went back to TC and voila, snaps were working again.
Hope this works for you, because working without snaps is impossible.