I just tried running org-mime-org-buffer-htmlize, which I have used successfully in the past. However, this time, I got an empty message buffer, and this in the mini-buffer:
org-export-barf-if-invalid-backend: Unknown "nil" back-end: Aborting export Any clues? I haven't used this in a couple of months, but it did work at one time and, as far as I know, I haven't changed anything that should impact this. Thanks! -pd