URLs can't be open ... flickering black screens appear

[Nina]

Dear all,

For a revision of a paper we need to run more sessions. We haven't unsed zTu for two years for this project.

When we try to opne the URLs just flickering black screens appear. Do you have any idea?

Best
Nina

[Nina]

I found the solution here: https://groups.google.com/g/z-tree-unleashed/c/bJcu1Uuz27Q

Thanks and best
Nina