First off, was the system working properly before you set up the limit switch or is this a total new installation?
Second, were you in continious or discrete jog? I discrete, what increment did you have it set to move and is Normal or Rapid highlighted?
If in continious, assumming you pressed only the '->' or '<-" key what is your slog jog set to? For example mine is set to slog jog at 1IPM and fast about 28IPM
Also, did you have Limits turned on or off?
Just some thoughts to get this figured out!