What are you trying to do?
You have an alias /idlemsg that calls itself with 2 parameters that aren't even checked. But since mIRC doesn't allow recursion, it sends that command to the IRC server. Does your irc server understand /raw idlemsg on idlealias ?

The inputbox shows up alright here, but then it gives * /idlemsg: not connected to server. So, something does show up, hopefully not what you wanted though.