For me, at try.nodebb.org, the captcha doesn't load.
I disabled AdBlock, looked for anything else that might block it, but I can't find anything.
Is this just me, or is this NodeBB? (Probably just me.)
Looks like the version of spam-be-gone on try.nodebb.org needs to be updated, the issue was fixed here https://github.com/akhoury/nodebb-plugin-spam-be-gone/commit/0872198eddd3f9e1bfc137be2e747ea8c58cca5a