Unable to send private messages

Hi, everytime i try to read a private message, the website would request for me to log in (even when I'm already logged in). When i try to send or reply to a private message, it would request for me to log in again. When i log in, the whole page will be empty and i will have to type my whole message again but i still can't send the message as i will be prompted to log in again when i press the "send message" button. Is it something to do with my computer? Thanks in advance for any help that i can get

I just sent a PM, maybe it was a bug?

Hmmm, it seems that if I don't tick the "keep me logged in" box when i log in, I will be prompted to log in every time i try to send a private message.... Weird. I tested this on 3 different computers with different web browsers and all appears to have the same problem. Oh well, at least i know what to do now...