Google sign-in isn't working
Usually blocked cookies or pop-ups.
Make sure your browser isn't blocking third-party cookies or pop-ups for this site - both can silently break "Continue with Google." If it still doesn't work, use the email code instead; it's an equally valid way into the same account as long as you use the same email address.
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Analytics are delayed - Expected lag, not lost data.
My analytics isn't updating - Give it a few minutes - dashboard views can lag slightly.
My analytics look wrong - Clicks not showing, delayed data, or numbers that don't match another tool.
Attribution isn't working - Usually means the link isn't attached to the video yet.