If the sender doesn't fill in the subject line then you can't read the message...
No, this is different. I've received PM's with no subject.
Here's what happens:
1. I receive an email notification that I have a Private Message.
B. I click on the link in the emailed Private Message notification, which takes me to the web Private Message page, except that it shows that I'm not logged in (but I am...)
3. I click on the site home page to log in, but.. I'm already logged in.
C. I go to the Private Message page, and there are no new messages there.
IV. I log out, and then log back in, still no new messages.
BTW, I only get email Private Message Notifications, with a link. I have never received the actual Private Message by email.
There is something wrong with the forum software, methinks.