In het AARGH NOW THEY TELL US Dept.:

Using Search Engine Friendly URLs (hiding the query string within text appended to the path)? This is a popular technique, and one that breaks when ColdFusion MX is installed. The solution is actually quite simple. Modify web.xml (it’s in the web-inf directory under the web root) to add the following servlet mapping: “<servlet-mapping><servlet-name>CfmServlet</servlet-name><url-pattern>*</url-pattern></servlet-mapping>”. Then just save the file, and restart ColdFusion.