Hi, I love this software, but there is just one thing that is driving me mad! 
I want the editor font not to be a serif font (I want to use Segoe UI), when I change the font in Edit > Preferences > Appearance it does nothing and reverts to the default font. Is there a setting that I am not aware of? I really do not want to have to reset the font for every scene, note and description. 
Is there a workaround for this problem? I am running windows 10 on a 64 processor,  oStory version 5.04.01

Unfortunately, the modification of the editor's font has never been fully tested. From what I understand from your request, that would certainly not meet your wish. Indeed, the proposed modification would only apply to the editor, but your seem more interested in a modification of the font applied to the text itself. If this is the case you should consider setting up your own CSS and setting it up in the export options. If you need help to build a CSS do not hesitate to ask me for it.

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