[imp] PGP attachment

[Nazar San]

i have imp 4.0
When i use pgp and https i can download attachment from letter only
when i open letter first time in this session.
the next time it don't found "mimecache" in cache (i think so)
had anybody else this problem or knows solution?
i can't try new version of IMP becouse change something in imp (this
changes don't touch message view)
so i need some patch :-)