Hi,
First post here, so apologies if this has been asked before.
Recently, once I open my Anki desktop app, it shows up like the photo attached, and if I click on my decks, the card/screen is completely blank.
Any help appreciated!
It looks a bit different, but I would assume it’s the same issue as here: Giant sync icon sometimes appears · Issue #983 · ankitects/anki · GitHub
Apparently, it’s caused by the GUI framework Anki is using and we’re probably stuck with it. I hope it doesn’t occur frequently and is gone when you restart Anki?
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I recently started to experience something similar occasionally for brief moments when disconnecting and connecting again to a network.
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Unfortunately, it occurs every time I start Anki 
I’ve tried uninstalling and reinstalling, shutting PC down, nearly everything
Then it might be something else. Please try the steps in When problems occur - Frequently Asked Questions.
Do you use any antivirus/firewall/proxy/VPN software? If so, you may need to add an exception for Anki, or temporarily turn it off to rule it out.