Hayato is right about this, and I must say that I am extremely grateful to those of the older players, who actually REPORT the glitches in the quests, so that they can be fixed, even when they might have an advantage of an abusable glitch being kept. (He is one of those good players himself).
Regrettably there are several of the older quests that aren't set up in an optimal way, partly because we didn't have the options in the DG_code back then, and partly because we simply were too inexperienced, and didn't forsee all the different approaches that a player could take to a solving a problem - we just test the quest the way that they are 'supposed' to be done, and sometimes forget to test the 'else' options.
One particular problem that many of them share is, that if you happen to lose a quest item that you are supposed to deliver in the middle of the quest, you might get totally stuck. In some cases there is a possibility to redo the quest from the start, but even that isn't always possible. So cases like this should always be typo reported, that makes it easier for us to fix the quests.
That said, I sometimes get a bit tired of players who claim that a quest must be broken, when the only problem is that they haven't yet figured out the right way it should be done. In some cases this is even a result of quest-blabbing - i.e. someone told them part of the quest but not all the details, and so they try to make shortcuts.
So, for the umptiforth time; Don't blab, and NEVER discuss quests over open channels - and that includes CT. Even if everyone on line has already done the quest when you start discussing, you never know when someone who hasn't logs on and catches part of the conversation.
So just don't discuss ANY quests, on ANY channels EVER. Period.