[Plugin: Formidable Forms] Hidden labels are not hidden

Hello,
there is a bug in the css for the current version. Hidden labels have an invalid value for the display attribute, so they are not hidden.

See inn frm_display.css:

.with_frm_style .frm_hidden_container label.frm_primary_label{display:hidden;}

http://wordpress.org/extend/plugins/formidable/