Main Grid not Painting Columns or Headers

After you login into Aras Innovator Server the main grid would never paint columns or headers, however pages such as InBasket or relationshipTabs could work.

Attempt to open the browser and you might see the following message: XML Exception: Incorrect comments tag

This is a client-side problem and the root cause of it is that the wrong version of the XML parser is used (this could for example be caused by installing Visual Studio v6 with SP6, that changes the XML parser used by Innovator).

The solution for this is to un-install and then to re-install the XML parser.