Can't reply in PMs

[SupermassiveMan]

Since the game's core is Flash, this can be due to several reasons. The most probable are:
- The person you are trying to send the message to has a inbox, and won't be able to receive more messages till previous ones get erased.
- That person blocked you.
- Your internet connection isn't fast enough to resolve the package where your message is.

Keep in mind that moder browsers and Flash aren't good friends. Also, since it's a MMO there's a lot of internet-based communication behind. This means a lot of resources taken from both your machine and internet service.