Wow. That's a new one. Thanks for the find.
Long story short, this happens when I try to parse floats from plain text. If Finnish uses commas instead of periods, then that explains the problem. I tried specifying CultureInfo.InvariantCulture in my ToString and Parse calls for those methods, so maybe that will work in v1.1 of this build. Hopefully there's a better solution out there because it looks like it's affecting other people too.
Anyway, menu and the other stuff is fixed, so I'll push an update soon.