Ok, will do. Might be a bit before I have enough free time, but I hope to post back within a few days.
> Thanks to Gentoo's portage system, I've already tried compiling/installing
> fuse and sshfs from source when I tried upgrading to sshfs 1.6 and fuse
OK, I say it differently then:
you need to compile fuse and sshfs in a way that the debugging symbols
are not lost. The portage system probably strips the libraries and
binaries at install time.
If you can tell portage not to do this, that's fine. Otherwise you
have to do the compile/install by hand.