Bug in the popup " Find a member" when select by letter, the normal page memberlist appear in the the popup.
The current mode is forgotten.
This bug appeared after the 3.0.9 update to 3.0.10
Open memberlist.php version 3.0.10
search (line 1298):
Add before on a new line:
search (line 1345 to 1350):
and delete these lines