BigGantt session has expired after upgrade

[Piotr Wąsiewicz]

Somoene update BigGantt to newest version. After the upgrade BigGantt stops working.
It is showing "session has expired".
We are using Jira Server 8.14
I can't remember which version of BigGantt was previously installed to do downgrade if it is possible.

[Anna-BigPicture · Accepted solution]

@Piotr Wąsiewicz, the plugin behavior you described is not standard; therefore, please reach out to BigPicture Technical Support via our Service Desk, providing more details. 

BigPicture Team will gladly assist you in pinpointing the exact cause of the issue and provide a solution.

[Piotr Wąsiewicz]

Thanks Anna
I wrote them a week ago, they partially helped but we got stuck on the intermediate version, still can't update to the latest one, I'm still waiting for help from the them.