Unable to load camel route XML even in Source view

This morning I upgraded Camel IDE to the latest version 1.1.70. Had a camel-context.xml open in the editor that after upgrading failed to be opened again. Instead of showing the file content, this error was displayed:

"Could not open the editor: org.xml.sax.SAXParseException: The prefix "cxf" for element "cxf:rsClient" is not bound."

The file (attached) has a syntax error but I would expect to open it in Source view at the least. Restarting Eclipse did not help either.
The error is correct, as I declare a cxf:rsClient without defining the cxf namespace (yet).
Again I should be able to open in Source view at the least.