The selected service should be under the web root of the current project's server.

C:\ColdFusion9 => c:\Coldfusion9  (be sure that coldfusion root folder is equal to the cfc's path)

(coldfusion root folder : default location for local ColdFusion server)

Try this:

open \\JRun4\servers\cfusion\cfusion-ear\cfusion-war\WEB-INF\flex\remote-config.xml  (or similar)

Traverse to this section:

<access>
                <!-- Use the ColdFusion mappings to find CFCs, by default only CFC files under your webroot can be found. -->
                <use-mappings>false</use-mappings>
                <!-- allow "public and remote" or just "remote" methods to be invoked -->
                <method-access-level>remote</method-access-level>
            </access>

Change this line:

<use-mappings>false</use-mappings>
To this:

<use-mappings>true</use-mappings>

Save the XML file.

Log in to CF Administrator and find the Mappings section.  Map your component folder with the name you want beginning with a slash.  Then browse for that resource folder.  Save

Exit CF Admin.

Restart Server.  Restart Flash Builder.  Then tell me how it went.

Anyone else have these problems with coldfusion builder and fb4. It seems extremely buggy.