For some reason certain messages, only for some users, are showing up either partially or totally blank and are not selectable. The mail server is not self hosted (migadu.com), only Squirrelmail (v 1.4.22).
I've confirmed the messages themselves seem just fine and are perfectly fine when downloaded via another IMAP client. I'm guessing it's something specific about these messages, but I can't figure out what to look for.
I saw some other posts talking about similar things and they seemed to point to a permissions issue, but I can't figure out what permissions I should be setting, and wasn't sure if those suggestions related to the actual mail servers.
See screenshot below.