The backup log file shows two Missed (external) Exhibits because at some point I had renamed the files. I deleted the exhibits for the individuals in question and added back the renamed files (as internal images this time). Yet every backup still shows them as Missed Exhibits.
I've tried File | Maintenance | Validate File Integrity as well as Reindex, but no luck. What should I try next?
(This actually started in v8 and, unsurprisingly, persists in v9)