In case anybody else runs into issues with text rendered in Agency FB being cut off like this: Replacing Agency FB in fonts.ini, fonts4k.ini and rich_fonts.ini in <Discovery install folder>/DATA/FONTS with the name of a font you've got installed in drive_c/windows/Fonts should fix this.
I'd currently recommend Agdasima, as it was made to be a fallback font for Agency FB. The style isn't quite the same, but it's fairly neutral. Rationale is another decent alternate font if you want something slightly different from Agency FB, but it does not have the exact same shape and size as Agency FB and thus won't fit quite right everywhere (at least not without further adjustments in the font .ini files).
I'm not sure exactly what it is about Agency FB that makes this happen yet; tried four different copies the font from various sources, five different versions of Wine and quite a few other tweaks with no luck. All of them get cut off in the exact same way.
