This issue occurs because the callback URL set in your GitHub account is not correct.
To resolve this issue follow the steps:
1. Log in to your GitHub account and navigate to Settings > Developer Settings > OAuth Apps:
2. Open the application and scroll down to the Authorization callback URL to edit the correct URL. For example: http://localhost:18000/oauth2callback
3. Click on Update application:
4. Open VCS in TIBCO Data Virtualization studio and check all the fields like below:
5. Click on verify and the browser page will be responsive now: