Remove not working

I track a tga file in mokey and when I go to preform a remove the remove key is not even highlighted. I have the layer selected I can do a patch but not a remove. Any ideas?

Please confirm.

You tracked a background layer.
Created a foreground layer (or created it earlier).
Select the FG layer and go to Remove.

The point being the background has to be tracked else it will not remove.
Unless the BG layer tracking is set to Disbable Track (indicating the layer is static).

I was having the same problem. What I found out was You must select the background first than the object you want to remove. Than go through it with the background selected to make sure that it is selected from start to finish. Then render, wala it works. I hope this helps.