Hi there,
Your issue might be due to using multiple Google accounts under the same Chrome browser. Google can't handle when multiple accounts are logged in. And so the Labelmaker Chrome extension doesn't work properly.
SOLUTION
Since you are using multiple Google accounts I recommend creating a new profile in Google Chrome with the account you are using Labelmaker with. This will make sure it'll always work with the right account. It takes only 1 minute to setup.
Let me know please if it helps,
Lucy