So I found another issue with fonts last night, I don't know whether this is a known issue or not.
It seems that if you have two fonts named like so:
Code:
Alegreya
Alegreya SC
and install them on the kobo, then RMSDK at least does not like it. I did not test ACCESS. In my case, when I installed the Alegreya SC font, it started started displaying in place of the standard Alegreya variant, despite the standard variant being set in the menu.
To solve this, I simply had to change the font name of the small caps variant to remove the space.
So it would seem that if you have to versions of a font, and the names up to the first whitespace are identical, there will be problems.