I am currently in test mode with authorize.net and on the payment input information it shows some the credit card entry along with the other required info but it is lacking a submit button. Any ideas?

I figured it out.

Yes I would like to know the solution. I have setup plans for regular single payments but I can not get the Submit button to appear at the bottom of the CC form, hence no way to submit payment. I do have plans setup for auto recurring payments that work fine. For some reason these single payment plans will not show the submit button, pressing enter does not work on the form. The source code shows that the button is not even getting rendered on the form for that page. Please help if you have any insight, thanks.

No bugs, I figured out the issue. I had my payment processor enable settings at <option value="2">Yes: AIM+ABR: Automated Recurring Billing for autorecurring plans</option>. This prevented plans that weren't ARB subscriptions from loading the payment gateway on checkout. I changed the enable setting to "Yes: AIM+ABR: Single payments or Automated Recurring Billing at user's choice for autorecurring plans". This let me access my payment processor with single payment plans. Now the "submit" button renders out and functions as I need. Hope this helps anyone that might be having the same problem.