Club Tropica was never banned:
http://www.habboxforum.com/showthrea...hlight=tropica
There was a specific section I think but then it was moved to online games as ---MAD--- said it would have to prove itself popular and the Beta was taking ages.
http://www.habboxforum.com/showthrea...t=club+tropica
I also don't remember any talk of Habbo threatening Habbox with anything. You would probably have more insight into this as you were an AGM at the time but my guess is that if that was true then there may have been a copyright issue as Callie was one of the main people behind it.