And if I click into the font, it displays correctly. But in my folder list, it just shows up as a bunch of boxes with X’s in them
Hello @hyp0xia and thank you for your post 
Unfortunately this does happen on some occasions due to how the information is coded into fonts and how the rendering engine works 
Could you try to remove and re-add this font and see if it helps?
Thank you again,
Yuriy
FontBase Dev Team
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This happens to about 15% of all my fonts, although they are correctly displayed in windows, we will have to live with that
Oh yes, I do recognise it.
But some time ago I found a cure: it happens when a .TTF has a 1000 base. Rename the file .OTF and it shows.
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Thank you!
I opened the troublesome fonts in FontForge and changed the UPM to 2048. Voila! Wish I’d seen your fix hours ago!
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Glad it helped, Frannie.
Welcome to the club.
It is unclear to me still, why it happens to only some of the many .ttf fonts that have a 1000 base; why sometimes changing the extension to .otf is enough; why on other fonts I have to recompile the font to .otf in FontForge.
I recently fully switched to Linux, on that occasion I spent days on removing duplicates, reordering directories etc etc.
Before removals, when I changed the to-be-kept one by either renaming or recompiling to .otf, all the remaining .ttf did show too.