As far as I can tell all the images should be working now. If you run across any pages with missing Clavius-hosted images, post the link in this thread.
As far as what happened, I'm one of the oldest customers of this particular hosting company. As such, my account has gone through numerous upgrades in technology, and avoided some by grandfather policies. So clavius.org ended up being a corner case of all the corner cases for their migration to a new authentication, control panel, and hardware infrastructure. I graciously let the programmers use it as a guinea pig to work out the bugs, the final step of which (last week) being that we inadvertently zorched all the images off their space and I had to restore them all from an offsite backup. Just goes to show that software is non-trivial even for something as straightforward as hosting.