The photo galleries are still down, I haven’t been able to figure out what is the actual problem with them. It’s possible the database has somehow been corrupted in which case it will be quite tricky to get things working again.
At least if worse comes to worst I can always do a clean install and re-upload all the galleries using the Lightroom plugin. But I haven’t quite given up yet and will still try to get things working again. In the meantime I might come up with some temporary solution to make some of the more recent shots available.