We have just transferred a Wordpress installation of CiviCRM 5.21.0 to a new server, but all of the search functions are failing. In advanced search, when I attempt to open for example, "Address", the following error appears and repeats itself on some kind of loop:
"Because your session timed out, we have reset the search page."
The Address option then just opens up another "Search Criteria" section underneath.
The parameters in the looping message are: page "CiviCRM" q "civicrm/contact/search/advanced" reset "1" snippet "json"
I've checked the database connection and that seems fine, it is returning the correct numbers of results in saved search smart group lists, but when I click "contacts" on the lists it shows no results, just the same error.