I have a problem with the Online Page Editor, that I never ran into before. I can login, and the pencil icon appears, but when clicked, a popup appears with HTML for a "500 Internal Server Error" (image below).

Hello Larry and welcome to DMXZone support forum.

The errror you are receiving is related with your hosting server provider. Please contact the server administrator to check the error log.

Regards : Vulcho.

I run the Online Editor on other sites with the same provider, with no problem. The only difference is the server software.

The sites that work run on the following:

Operating System:Windows
.Net Runtime Version:ASP.Net 2.0/3.0/3.5
IIS Version:IIS 6.0


The site with the error runs on the following:

Operating System:Windows
.Net Runtime Version:ASP.Net 4.0
IIS Version:IIS 7.0

Does any of this make a difference?

Update:

I took a website that worked on the first server, and placed a copy of it on the second server. This time I was able to bring up the HTML Editor by clicking the pencil icon, but when I either closed or saved, I got the same popup.