I am trying to create a form with a drop-down list, but when I test it, it generates this error message: "500 - No validdatabaseconnection." If I turn off the select-list, the error goes away. Is there a fix for this?

We have had some reports of this happening on Joomla installations that use Joomfish. Please try changing your database from mysql to mysqli in Joomla's Global Configuration settings and see if that fixes it.