I just upgraded to DAP 4.x. The login page when clicked after successful login shows the message
Did you previously customize the dap/inc/language/english.php and save it as dap/inc/language/custom.php? (you have done this for internationalization, or for customizing DAP’s messages).
A) If you answered “NO”, then simply delete the file dap/inc/language/custom.php from your server.
B) If you answered “YES”, then then there are new messages in dap/inc/language/english.php that you need to copy over to dap/inc/language/custom.php