Hi Steve,
You have to tell CR Designer what framework to start up in also to view your UFL.
If you don't have one create a file called "crw32.exe.config"
and put this in it or edit the one you do have:
<?xml version ="1.0"?>
<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true" >
<supportedRuntime version="v4.0" />
</startup>
</configuration>
You should now see your UFL in CR Designer.
Don