In the SP admin panel, under Users / Member information I see no members found despite having 30K+ members:
Clicking on any of the member groups (Moderators, Donateurs) also results in "No Members found".
Odd. What versions are you using (WP and SP)?
I certainly can not replicate nor have we had any other reports of such behaviour.
Could you go the toolbox and open the error log. Empty it using the button at the bottom. Open the forum admin > Users page again and then go back to the errort log to see if anything gets reported.
You were right: I looked at my PHP log and found this relevant error after loading the SP member list page
Column 'moderator' in field list is ambiguous
I have a var "moderator" in my wp_users table and you have the same var in your wp_sfmembers table: hence the ambiguous.
No deal: I can live without this screen 🙂
So must have been added by another plugin as its not part of standafs wp.
We normally try to prefix columns with table name when using non simple press tables but obviously didn't here. And only issue when added by this other plugin. Will see if we can clean it up it next version