Please upgrade to 2.1.x here.
The 2.0 branch is no longer being updated.
On the Dashboard > Vanilla Statistics we get:
Vanilla Statistics has had an accident
Permission denied - Token Verification is required, but failed.
On the dashboard > settings > Statistics >API Status we get:
Problem with credentials.
We are using the forum behind a firewall/proxy and embedded in a section of the website that requires a login.