I don't think it's an Apache bug since it's done it across multiple versions, and my other rewrites don't generate any errors. That brings up another possibility though, that I'm running
vbSEO for rewrites on the forum side. I can't think of a way that it would matter, but could they be conflicting? My forum is in /forum and the gallery is in /gallery.
I've been watching the error_log all morning and it generates that error on other
seo'd links (like personal album), not just the member-galleries url.