Symptoms

When running any SmartForm from Runtime inside the server, it works as expected. When you try load the form outside of the server, you may see that CSS has not populated the form and the background on run-time.
 

Diagnoses

We were able to use F12 in internet explorer. Monitoring the network traffic we noticed that there was an internal 500 error when trying to call the CSS files.
 

Resolution

As a work around we did the following please note there may be a slight performance lose when making this change.

We edited the runtime configuration file (web.config) :

<add key="Forms.PostRenderCombining.Enabled" value="true" />

Changed to

<add key="Forms.PostRenderCombining.Enabled" value="false" />

we then did an IIS reset