I have just noticed the same thing with Railo 3.3.0.010 and ACF8
<cffile action="move" source="#loc.args.source#" destination="#loc.args.destination#" nameconflict="overwrite">
throws and error in Railo but works in ACF8
works if this is put before it
<cfif FileExists(loc.args.destination)>
<cffile action="delete" file="#loc.args.destination#">
</cfif>
Should I raise a bug?