ExcludeExitNodes settings ignored

Tor Browser 6.5.1/Win 7.0x64

I have the following in my torrc and the browser happily selects US nodes

DataDirectory E:\Program Files (x86)\Tor Browser\Browser\TorBrowser\Data\Tor GeoIPFile E:\Program Files (x86)\Tor Browser\Browser\TorBrowser\Data\Tor\geoip GeoIPv6File E:\Program Files (x86)\Tor Browser\Browser\TorBrowser\Data\Tor\geoip6 HiddenServiceStatistics 0 ExcludeExitNodes {US},{CA} GeoIPExcludeUnknown auto

Trac:
Username: JoeDiFostar