A shot in the dark. Looks like a modal window that does not provide a button to dismiss. That could be code left by a developper that should not show up once a version is released.
What is displayed is an empty Web page, as if the HTML Viewer was not able to read the contents of the page.
HArd to debug. If you feed the same HTML to browser like Safari, Chrome, etc., does it display fine ? Do the Dev tools displays errors ?
Thanks for the replies ( I have been out of town )
planteg: yes code displays fine in browses and if FM does not hang it displays fine.
Kirk: the webviewer is blank. All code is set/pushed to webviewer via the script
FYI I have up'd the pause time to 1.5 which might have done the trick. The next test if the issue persists is to calculate the full HTML and payload together and skip the Perform JavaScript in Web Viewer step.