Update raises error when special characters (percent, degree sign, ...) are found in updated elements

Which products are affected?
Google Earth 5.1 (GE 5.0 also)

What steps will reproduce the problem?
1.Load a KMl file containing <name> or <description> using <NetworkLink>
2.Update <name> or <description> via <NetworkLinkControl>:
<Change><name>New name containing "%" or "°"</name></change>
3. Update fails

What is the expected output or behavior? What do you see instead?
GE 4.3 works fine

GE 5.1 will raise:
Error when parsing file: "http://... at line 2, column 0: 
Failed to create object <kml>

What application versions (if any) are you using?
GE 5.1

Which operating systems (and/or relevant web browsers) are affected?
Windows Vista

Please provide any additional information (code snippets/links) below.
Error is raised only on updates.

Initial KML documents loaded from disk or via <NetworkLink> can contains 
special characters, they are properly displayed:
<name>Initial name containing % or °</name>.

Replacing special characters with HTML codes ("°" -> "&#176;") solves the 
problem in <description>.

Original issue reported on code.google.com by g.ba...@gmail.com on 24 Sep 2009 at 5:42

devdattaT / kml-samples

Update raises error when special characters (percent, degree sign, ...) are found in updated elements #307