Custom avatars not being served, just generic (which are missing)

[Sir Osis of Liver]

If you're still not getting this, upload a clean set of 2.1.2 files from large upgrade package (don't need the upgrade files), that will replace existing files and directories, and should add empty /custom_avatar.  You'll have to reinstall your theme and mods.  Check /attachments, all hashed filenames should have .dat extension.  You'll have to manually move uploaded avatars from /attachments to /custom_avatar.