I'm not sure if this, is your problem, but I did run into bug 1:
Wahooka bugs.
1. Where Wahooka first appears, and asks for something of value,
you (sometimes) can't get him to re-appear. I'm not sure if
this was properly fixed in v1.2, but I have heard that if he
talks to you but doesn't appear, pressing 'Y' will help.
2. Going down to the lower level, then back up to where you are supposed
to meet him for the second time, the game sometimes "hangs, crashes,
aborts, or other weird things". This is also supposed to be fixed
in v1.2.
3. Wahooka doesn't appear in the sewers. If you never walk on the
square necessary to make him appear (??? can it be done???) he will
never show. Sometimes if you have been 'bugged' in an upper level,
he won't appear either. This is a minor annoyance, since all he
does is give you a key to a chest with some good stuff in it. The
chest contains nothing needed to finish the game.
(directly copied from JMeloy's FAQ over at gamefaqs)