This is definitely the issue. After even longer, I see repeated “GET https://api2.cursor.sh/auth/full_stripe_profile workbench.desktop.main.js:2349 net:: ERR_TIMED_OUT” messages. When I go to https://api2.cursor.sh in my browser, it it not blocked.
Edit: Someone else with the exact same issue: Why isn't Cursor's Autocomplete Working? - #3 by amitd