I haven't posted about this recently because I figured it would go away, but it has been at least a couple of weeks and I still cannot send personal messages to anybody.
Every time I try, the page merely times out, and I assume that the message does not get sent.
When I've accessed this forum from my mobile device, I've occasionally seen a warning that says "High Server Load Detected." Not sure if that is related, but I would really like the ability to send PMs again, just in case I need to.