Huzzah! I think/hope/pray that I've tidied out all the debris from the server crash nobody told me about. Indexing's still a bit fragile: I can see me having to rebuild the keyword databases a few more times before they're properly stable, and that after the LMS company's support manager deleted the file and rebuilt the data structure (which is as scary as it sounds!). Still, no matter, it's just the system that 95% of the service's performance processes depend upon.
Now, if it had been a wobbly cupboard then that would have been a different matter, especially had it been the wrong colour. The full panoply of library management would have been urgently involved.