Ugh.
I am away with no system access for the next 8-10 hours. I will fix it at that time if it's still down then.
Background:
A previous failure, which is very likely recurring, was a problem related to the image trying to send mail, with failed processes consuming image memory until things locked up. I changed an smtp parameter in hopes of correcting it, apparently that did not work or I just misunderstood the problem.
How I fixed it last time: Zip up the image/changes files and preserve them. Download to my PC, run on a locally built interpreter VM, which was able to open the image without running out of memory (as was happening on the server). Terminate runaway processes and resave image. Copy it back to the server, then kill the running squeaksource VM to restart things.
If all else fails: Reasonably recent backups are in a ./BACKUPS directory, so restart using the most recent image from backup. Check file dates and look in the ./ss/ss.log file to see what may have been lost. Most stuff just comes back automatically from the file system, but things like user account changes live in the image.
Dave