We are experiencing an issue with dynamic content on 1 particular server with dyanmic content not saving in edit mode.

Steps to reproduce:

1. login in > edit mode > find a page with an xhtml property. 
2. click {dynamic content} and pull content from another page by selecting a page and then the property name to pull from. Click Save 
3. Click edit on the newly added dynamic content box. If the top dropdown box (type) has not remembered what was selected before then the test has failed.

Installed on Server running : Windows 2008 R2, SQL Server 2008 & EPiServer 6 R2 site.

On this server there is also an EPiServer 7 site running and we are wondering whether this might be causing the issue.

In addition, I have installed the standard AlloyTech EPiServer 6 R2 site on the server also and that is also failling. 

This same site is running on another UAT server and dynamic content is working correctly.

Any help would me much appreciated as this is running in a production environment.