Hrm, how many sets of leaves/branches did that plant in the above pic have when you topped it? I can't see past the pot. Looks kinda young. I wouldn't top a plant before it has five sets plus the shoot you cut off. Very young plants don't have a lot of leaves to absorb energy, nor a lot of reserves to draw on to heal from damage, so if you top a very young plant, you might stunt its growth for a while. That'd explain why it's not produced any new growth shoots yet. It'll recover probably, but yeah, it might take a while. Can't undo it in any case, so no choice but to be patient now. Heh.