08 Oct 2011, 15:03
I'm having the same vanishing submit button problem, but its invisible regardless of any default themes used.
I was using the default Gardner theme for quite sometime before it happened. Currently using version 2.6.4, perhaps upgrading may fix this.
[edit]
Updated to 2.7.5.2 and send button still missing....BUT...found out why.
The image I was using on the contact form was too damn wide so it pushed the send button outside of the form!
shrunk image down and submit button is new viewable!! my bad! haha..