Take a look at your [mpopup] section, where you have 3 n6's and 2 n7's. I'm too lazy to goof up my own popups.ini like this to see if this would cause your symptoms.

Also, your current

n13=.Try double-clicking in a channel window!:

should have a HALT after the colon. This menu choice probably doesn't appear in your popups right-click menu without it, does it?