hey pieter..... i had given your other font question a lot of thought but could not think of any obvious solution......
couple questions come to mind..... have you checked or possibly changed your windows font size or screen resolution.....
in control panel click on display, -> settings -> advanced -> general -> then check your dpi setting.... there should be a normal value.... set it at normal if its not........
it seems to be a ms windows setting...... if your using xp, have you tried to use system restore.... choose a date well before the problem if possible......
still studyin on it..... if anything else comes to mind will post later......h