Okay, I've got the issue with the font settings sorted, I think, as well as the issue with very short 'Marked for Later' lists (which was actually affecting /any/ of the 'work index' views with only one page of results). I can't replicate the issue with the Plato fork - it works fine side-by-side with Ao3 Reader for me - so I think it may just be an artifact from an old build before I cleaned up all the file names, maybe?

This is the newest build, if you want to give it a go: http://seam.rip/ao3reader/ao3reader-0.1.1.zip