For some reason when any use including operators try to create portal such as Nether, End, Twilight Forest it does not work. we have checked plugin configs etc and found nothing. Is there any mod that may be not allowing this or something?
I've heard disabling Railcraft's invisible pathing can solve this if you are experiencing it:
Try setting block.hidden=0 in Railcraft's config. Railcraft by default creates hidden blocks for player aura tracking, which are recognized as air if using Forge isAirBlock(), but probably won't be recognized as air by Bukkit plugins (unless they specifically test for it).
