hey baker, i'm the baker that was having this problem
and that anon got it wrong. i ALWAYS use the index to bake - i can't use the catalog because of the script i'm using that highlights you's and Q's posts.
doing what i normally do, the first post went through fine. captcha disappears after that. the only fix that has worked for me is opening a new window to finish the bake. i don't think i needed to restart. the first time i came across the issue i restarted the browser but just opening a new window should work fine.
hope that helps and thank you for baking