I did all Porunga quest and haven't seen a bugged one yet... I even live streamed it on my youtube. Only problem is the quests don't give enough xp to advance you to your characters next level. for example.. you start level 55 and have a set amount of level 55 quests in a quest line. If you finish all the level 55 quests and are still level 55 after they are done, you'll be stuck farming a ud3 or mobs until you hit 56 to get the new set of quests. and its the same all the way up to level 59... im curious to what "bugged" quests your talking about.
iam totally wondering too what you doing i did not use any xp scrolls from 1-60. In Porungarock South you can easy 55-60 / 61 lvl with Dragoncave Quest, without grinding. When you guys not doing the Starter Questline from piccolo in Red Map you missing than some Quest. Or when you guys missing too,to go again out of the dragoncave dungen when skipping in ther a quest and getting no follow Quest.
Yeah Saucegod maybee you watching than my Broken Quest Video about that area you totally wrong with try to kiling the Frieza Army Boss their, maybee you look really on Minimap what is marked.