That's worrying, neither of those things are happening for me. Are you on the Linux or Windows version?
I have a theory the savefile issue could be because reading savefiles is using a RNG-dependent obfuscation algorithm and the underlying RNG library has been silently changed since the previous version of GM so old seeds don't work anymore (so it erroneously reads extremely long array lengths and the infinite loop being parsed as a crash). The font issue, I have no idea (all dialogue should use the same font, and it's only scaled up or down depending on window size).