Do me a favor, type: /remote off
Then type: //echo -ac action This is the color of action.
Does that work in your client?
If so, you can type: /remote on, once again. Open up your remote scripts, and paste any "on input" scripts here. I have a feeling it's one of your on input scripts that is messing things up for you.
If that //remote off | echo -ac action This is the color of action. Did not work for you. Then I'd suggest trying to install a fresh mIRC client, and copy the scripts over to it one at a time, until you find the culprit script.