I feel like such a moron!

While the captcha image did stop working w/o my doing anything, when I was troubleshooting I was changing the Gallery setting "What Graphics Library do you want to use?" thinking it was global. Just noticed in Registration Settings (where I was gonna turn off captcha in the meantime), and there it was set to ImageMagick. Changed it to GD2 and now the image shows. I just want to slap myself for being an idiot!!

But thanks, guys blush

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