From a bug report. (Michael forwarded a newsgroup posting about it back
then, but I had trouble reproducing it and didn't figure it out until
trying again now.) If hangup occurred while entering the quest, the magic
portal could be rendered inactive for the hero but still work for monsters.
That's because the hangup save stored the old value of u.uz0 before
goto_level set it to the new u.uz, and a magic portal won't operate when
u.uz0 differs from u.uz (to prevent a pair of portals from getting stuck
sending the hero back and forth). The problem could also occur going from
the quest back to the dungeon, or either direction for Ft.Ludios, but the
--More-- prompt when the quest entry text is being displayed makes hangup
during level change most likely to occur during initial quest entry.
This is just a bandaid, and the SAFERHANGUP config wouldn't be hit
by this situation.
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