Mavericks - Can't jump up or down

Set TS to use Ctrl-arrow key to jump between spaces. Works OK going left or right including cycling but will not jump up or down (using 3x3 matrix of spaces). Won’t upgrade to v2 unless this is sorted - need to keep my established use of TS.

It should certainly work. Do you by any chance have ctrl-up and down assigned in System Preferences? (Keyboard->Shortcuts->Mission Control)