I don't usually click the Loop or Hook buttons on my Players, but I was playing with them tonight.
Both buttons can be clicked during Play mode (!), which doesn't seem 'right' to me.
If you click Hook during Play, the Hook button 'lights up' but the
HOOK indicator does not appear in the Player status text (beside ON AIR). If you leave Hook 'active' and click Pause then Play, the
HOOK indicator
does display (?). It's hard for me to test this further because I don't have any tracks with Hooks defined.

Maybe Hook buttons on Players should simply be made
Visible=False during Play mode? I can understand why you might want to be able to click Loop while a song is playing, but I can't see any reason why you might want to click Hook
while a song is playing!
--
BFN
CAD