You have mySQLi recordsets on the page, but the UI is the old DW one, not the one that comes with DataBridge and/or MySQLi Server Behaviors.
My best guess is that you installed the "Deprecated Database and Server Behaviors" extension from Adobe after the WebAssist extension and that overwrote the Dynamic Select List dialog.
The best option at this point is to Re-Install DataBridge and that should update the Dynamic Select List dialog to recognize MySQLi Recordsets.