After I have upgraded my site to the V 1.8.0 anonymous avatar no longer Appear in q-list or questions or others .So please who have any idea about this problem can help us find out what happend
That will be fixed in the yet unreleased v1.8.1. It is, however, already fixed in the bugfix branch you can download from here: https://github.com/q2a/question2answer/archive/bugfix.zip
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July 15, 2020: Q2A 1.8.5 released!