Frame Selection issue in Toon Boom Studio 4

For some reason in the middle of working on my animation, the program would no longer allow me to select specific frame cells in the timeline window. even using the shortcut to move ahead 1 frame doesn’t work, the only thing that happens is i can select, one out of every ten or twenty frames. I tried switching to a new scene to no avail, then i tried restarting the program. i was able to skip ahead 1 frame at a time using the D shortcut, however when i tried to select a specific frame with the mouse it would simply select a random frame, and once again i would be unable to select specific frames. I have tried closing the timeline window, however that simply makes the program freeze entirely. Someone HELP!!!

Hi, Alex,
Did you try to reinstall the program first ?