First off, the signals from your camera and the signals used to control the Socket Rocket are different. The camera uses the 2.4 GHz radio-frequency signal to send a picture to your TV or computer. The Socket Rocket is controlled using X10's power line carrier (PLC) signal, which travels on your AC power.
There are a few things that could prevent you from controlling the Socket Rocket in the new location. When you had it in the basement, did you change its address? If you changed the address and then moved it, the Socket Rocket could be set back to the default address of A1. Is that the address you have on screen in ActiveHome Pro?
Another thing to check: do you have other lights in the kitchen that you can control from the PC? If you move the Socket Rocket to another room can you control it? Sometimes the X10 PLC signal can be prevented from reach parts of the house by other electronics or appliances, or how the wiring is done.
Finally, what kind of light are you controlling in the kitchen? If the lamp isn't within the specification of the Socket Rocket, you may not be able to turn it on and off.