I already done that, but I do not remember if I rebooted afterwards...
On my system I didn't need to reboot (its not windoze anyway;).. just close all windows and reopen them.. but I'm using picasso96, maybe it doesn't work at all on cgx..
whats the point in storring icons in chipram and videomem???
Note that the original Amiga(s) had no fast ram at all.. and the point of storing things in graphics memory is usually that its much faster to access for the graphics processor than the "ordinary" ram..