I just tried and tried to send a PM here. I had just replied to one sent to me with no problem. Then I tried to send one to another person. I couldn't preview or send. Nothing happened when I clicked on the buttons. This was on FF. So, I tried IE. On IE, when clicking on "send", I got a a warning that I didn't have the correct level of privilege to send the message or I wasn't logged in. I was logged in. So, I scratched my head and tried Mozilla browser. Finally, I noticed that I had forgotten to put a title in for the PM. I put in a title and that fixed the sending/preview problem. I think for those who don't send a lot of PMs here that having a popup or some kind of error message when you have forgotten to put in a title to a PM would be helpful. I don't know if you can do this since this VBulletin software doesn't give tons of options but if you can, it might save others the puzzlement I had. (At my home site, we don't use titles for PMs so I didn't remember that this site does).