Demonlink
Any chance you abused the ->Next combo + secret flag bug? If that's the case, then...
@DemonLink in the "Emulation" menu in ZC, enable the option "Buggy ->Next Combos".
If you update the quest, probably a good idea not to exploit a bug like that. Fun thing happened here, as far as compatibility is concerned; Zoria asked in numerous places if anyone used this bug before he fixed it. After a while, not one person said they did, so he patched it. Then people suddenly complained, but there were also quests that now relied on the patch; normally a QR would be the obvious answer, but 2.53 is at it's QR limit and can't get any new QRs! So, the emulation menu is the only way to fix this in 2.53 (aside from updating the quest to not abuse the bug).
EDIT: Yep, opened the quest to look and surely enough there are secret flags on next combos. A ->Next combo, by definition, goes to the... next combo. Them doing anything but that has ALWAYS been a bug.