v3.4.0.beta3-dev로 업그레이드 후 Discourse 인터페이스가 시작되지 않습니다

[RGJ (Richard - Communiteq)]

You seem to have a few relatively unknown plugins. At least one of them is known to cause issues which are very similar to yours:

@md-misko

there is an issue with Moderator attention plugin, which prevents only moderators from logging in (loading page shows colored dots in perpetuity).

All other users are unaffected. Disabling the plugin and rebuilding fixes the problem.

So you might try uninstalling that one.

What does your browser console say?