Hello
would you mind reading our support request on this portal ( especially last reply from the developer )

www.sourcecoast.com/forums/non-commercia...popup-in-full-screen

issue is caused by jms2win component as he suggested to contact you for help.( which will be appreciated )

thank you

Just wondering what is the average response time from support?

Hello

just wondering what will take in order to receive support with this issue ?

thank you

Can you send us this module in the attachement of an email for a review.

I suspect that the extension compute the path itself and not use the JPATH_ROOT.
When calling the php realpath function, this return the physical location of a file and not relative path to the "document root" of the website.
This may result later by a wrong CSS path computation.

If your symptom is a wrong path to a CSS or things like that, that would mean that realpath function is probably used instead of the JPATH_ROOT.