Here is one for you to think about. It seems when you create a form like a login form it creates a css file that will overwrite your current css that is used for other DataAssist created forms. The result is all your previous created DataAssist now use the css that was created with a new form. Shouldn't a new form or forms created with the Form command have their own css file?
To fix it if yours is overwritten, you have create a new series of DataAssist forms to recreate the orginal css file and upload it.
Just a thought.