So just happening right now, that Anki is refusing to let me review my cards. It just shows a blank screen. I tried restarting Anki multiple times, and nothing worked, except that it allowed me to review a couple of cards and then it lags out. Restarting my laptop did not help at all as well.
The only notable change I did today is that I changed the note type of only one deck (though I doubt that would even cause a catastrophic failure) and that my computer is a bit hot, though I Anki has always worked with my laptop is hot as an oven.
Did I reach a max card limit or did I somehow damage something I am not aware of, like the database?
What is the reason behind this odd behavior 
My Anki is stifled because of this
Here is a couple of screenshots, where it literally just shows me a blank screen after starting the review.
If I click on the editing screen, it shows me that the card is still there yet it is not displaying smth at all
Happened again just now. Tried reviewing, worked for a few cards and then just freezes completely and prevents me from even getting out to the deck overview.
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Now it just shows a blank screen
Restarting without addons does not help at all. It just completely freezes at this screen.
Editor and Browser work just fine, but I cannot access the cards at all (or it will allow me to review just a handful and then freeze)