I’ve tried every recommended solution, yet none of them help with my cards showing up blank. They show when I click edit, but not when I press “show answer”
If something is there when you are editing, but not when you are studying (and presumably not when you Preview the card?) – then it sounds like a template problem.
Are you using a default note type and templates? Have you added any additional fields? Did you also add those fields to your card templates?
If you’d like to post your templates – front, back, and styling (as text in a code/preformatted block, please) – and some screenshots to explain what is supposed to be where, perhaps someone can help you.