checked all loaded scripts, and nothing.
the /who is not working for me.
if i /remote off - it works again.

Which version of mIRC are you using? When /ialfill was introduced, it muted /who output to the status window. This has since been fixed.

You can also write your own script to prettyify the output of /who into more readable lines, if that's something you're interested in. Otherwise, you can use /debug @debug for now.

Ok got it working... there was a "raw" event in one of my scripts loaded...