hi,
if your multiselect not populate, it means that the user that you entered in the textbox has no session_id, trying to get others users to see.
precision, there or you wrote session_id = $session_id$ , remove and put just $session_id$ because prefix session_id= is already defined in multiselect.
for the input text the user, remove <default>user1</default> and put <default>*</default>
try and let me know if it works.
please forgive my english.
if it works, don't forget to vote my previous answers.
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