solaris - Strange ZFS hidden filesystem problem

Half of my ZFS filesystems are hidden in ZFS-fuse. Here's
my story:

So, I love ZFS. I used it for about
six months on FreeBSD, but due to it crashing the kernel during heavy inter-filesystem
IO load, I tried switching to Solaris
5.10.

That was good, but when I
attempted to do an import of my Version 13 pool into its Version 4 version of ZFS, there
were some heafty problems. It may have tried to correct the filesystem definitions, I
don't know.

Since that version wasn't compatible
with my pool, I've now switched to Ubuntu Server 10.4. That version more than supports
that of my pool, but I can only see half of my filesystems. The filesystems I can see
are the same as those Solaris could see.

Now,
despite those filesystems not being preset in a 'zfs list' command, I can still set
properties on them and I can even still mount them and read and write files, but they
just plain don't show up in 'zfs list'.

I've
mounted the major ones, but I'm not sure what other filesystems there are anymore (I
have about eight that I can't see).

Anyone have
any idea what the heck is going on? I think I might try booting back into FreeBSD 8 (I
still have the main boot drive laying around for that) and see if at least it is able to
view the filesystems.

I've also done
a scrub while in Linux, and it found no errors with any of the data. Oddly, DMA read
errors which caused problems on FreeBSD ZFS are reported by Linux, but ZFS-fuse doesn't
find an error. That's a topic for another post however.

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