I just saved my first private message, because I just wanted to write myself a reminder of something, and when I went in to look at it again, I saw this message above it in the Edit screen.
Warning: Invalid argument supplied for foreach() in /home/moltenwo/public_html/wp-blog-header.php on line 348
I changed the message to a draft instead and it goes away, then it came back when I made it private again. I don't know what this is. I don't even know what wp-blog-header does, I've never looked at it.
Sound I be concerned about this? I don't actually plan to use the private messages, since I don't understand what they are for, if I can't see them, except going in to edit them... but I just wanted to check this out...