There were a few problems fixed related to this. However, there is an issue with the _minihtml_SetProportionalFontSize() function. The Options dialog uses this as well as a number of other places. The options dialog tries to use the default dialog font instead of the default html font. Should be ok to do this but there's a bug with _minihtml_SetProportionalFontSize() where it messes up the font sizes. There are a fair amount of places that use this function or the other one _minihtml_SetFixedFontSize(), which is also messed up.
This will be fixed in RC2