Okay good. I think the server was actually caching some files/pictures that were not 'right'. Purging that cache seems to have helped.
If only the cache could provide some cash to fund the NAS, then we'd all be happy.
In all seriousness, thanks for everything you do to keep this site running. Having been on your side of the monitor for a similar sized motorcycle forum, I'm all to familiar with the joys of maintaining the server, software, and network related items that seem to always go burp when there's someplace else I'd rather be (or usually just when I'm swamped with work). This site has been a huge learning resource for me, not to mention the recreational value in connecting with others who share the same passion.