Hello:

 

I believe that you should use C-c C-k . This will compile and load a lisp file on my pc (I'm not sure if you use the same slime version). In my pc, C-c C-c only compiles the file, but doesn't load It.

 

>I should add, that when I close Emacs, restart it, get into the LTK
>environment and load fgs, then the changes show up.
Well, surely, if you do (load "fgs" ), lisp searches the compiled file and loads that. Then the changes show up.

 

I hope to be helpful
--
Felip Alàez Nadal