When an Op hides, they want to be invisible, right? Well, you can PM them if you suspect they are hidden and it will show their name and the message you sent to them. This is bad because some players might try this and not misbehave until the Op really goes offline. By making it say 'Invalid username.' if you try to PM them while they are hidden, they might be able to catch more people doing things they shouldn't.
If this has been talked about before sorry, I didn't see it.
If this has been talked about before sorry, I didn't see it.