Weird. on Win7, 7.43, I only have '9' available in the list for fixedsys, same on 6.35 actually.

Anyway, you can use the /font command to manually set the font

/font -z -12 fixedsys would reset all the fonts to that settings


Looking for a good help channel about mIRC? Check #mircscripting @ irc.swiftirc.net