I *think* there are two different versions of the four player adaptor, one that came (IIRC) with Gauntlet 2 and one that works with pretty much every other game.
I once had a version of Gauntlet 2 in which player 3 could only move, not shoot (my current (WHDLoad) version works fine though). Another game that didn't recognise the fire button of player 3 was "Wiraz" (a very poor polish racing game). The (homemade) adaptor works with *all* other games I have.
Here's a list of
all games supporting the adaptorDo you know to which game your adaptor belongs? Maybe you got the version that only works with Gauntlet 2 and Wiraz (or was it *V*iraz?).
Or your adaptor is broken. Try to open it (if possible) and have a look. It should be easy to spot if a cable got off a pin.
Do you know if it is ok to plug and unplug joysticks to it (4-Player adaptor) while the computer is on?
It may damage your computer, though it's not *that* likely.
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also it does not seem to support Sega pads with 2 buttons or CD32 joypads?
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It only supports one joystick button. It should work fine with CD32 pads (never had one, but one button on the CD32 pad must be electrically identical toa standard fire button).