Server move problems - error with viewer library

Hello.

I have searched through the forums but can't quite find any other issues that are the same that I am facing.

I have developed a CMSBuilder site on my own cpanel linux server. Everything works great.

The client then moved this to their internal server, so some of the file paths are going to change from public_html stuff to var/html etc.

The site works great on their internal server.

However, if I add a new section editor to the site on their internal server and copy and paste the code generator stuff, the page does not display, but simply loads the following error:

"Couldn't load viewer library, check filepath in sourcecode."

The paths to the files all look correct and the old pages created on my server work and function correctly on the new one. It's only new ones created on their server that are causing issues.

At this moment I don't have access to their server, so cannot copy and paste full source code, but I have checked that it is identical format to the other pages and it is.

Very puzzled.

Thanks for any help!