I am a developer for Cognito Forms. We recently released support for conditionally visible fields, sections, content, etc. based on custom calculations on forms. As part of this we also conditionally hide these fields when sending email notifications with submitted form data. Unfortunately there was a small bug related to conditionally hidden content fields, which your form uncovered (because it was quite complex!). So while the entries are being saved, the email notification is not being sent and the confirmation is not displayed. The fix is currently being tested and will be deployed soon. You can avoid the issue for now by not sending detailed email notifications.
Thanks for also submitting this as a bug report! Bug reports through our product are the appropriate way to report issues, as this site is intended as a forum to ask questions about how to use Cognito Forms and other web apps to solve problems.
Here is some sample css that fully customizes the look and feel of the fields and validation. It isn't pretty, but illustrates how to accomplish this:
.cognito #c-forms-form{ background:#aed136; color:#698215; font-family:'Open Sans'; overflow:hidden; padding-right:3em; }
.cognito .c-section,.cognito .c-field:nth-child(1){ margin-top:0; padding-top:0; }
.cognito .c-forms-heading{ display:none; }
.cognito .c-label,.cognito .c-editor,.cognito .c-action,.cognito .c-validation,.cognito .c-forms-thankyou-message{ margin:0; padding:0 4px!important; }
.cognito #c-forms-form label{ color:#FFF; }
.cognito .c-label{ margin-bottom:.3em; }
.cognito .c-editor{ margin-bottom:.2em; }
.cognito #c-submit-button{ background:#9fc226; border:0; float:none; font-family:'Open Sans'; font-size:1.5em; font-weight:900; margin:0; outline:0; padding:.4em; width:5em; }
.cognito #c-submit-button:hover{ background:#698215; }
.cognito .c-editor textarea{ height:5em; resize:none; }
.cognito .c-editor input[type=text],.cognito .c-editor textarea{ border:0; box-shadow:inset 2px 2px 0 2px #eaeaea, 4px 4px 0 0 #a6c92f; color:#d85527; font-family:'Open Sans'; font-weight:500; padding:.6em; }
.cognito .c-editor input[type=text]:focus,.cognito .c-editor textarea:focus{ background:#fff5f1; box-shadow:inset 2px 2px 0 2px #ffe4db, 4px 4px 0 0 #a6c92f; outline:none; }
.cognito .c-validation{ background:#d85527; border-radius:0; font-size:.8em; left:0; margin-top:-.4em; position:absolute; }
.cognito .c-validation:after{ border:solid transparent; border-bottom-color:#d85527; border-color:rgba(0,0,0,0); border-width:7px; bottom:100%; content:" "; height:0; left:15px; margin-left:-7px; pointer-events:none; position:absolute; width:0; }
.cognito .c-field-required{ display:none; }
As an example of how to use this, I created a simple HTML document with the embed code for my form, and added a <style> element to the <head> tag with the above code.
edit: I'm a member of the Cognito team
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