Unfortunately you're not going to be able to use the standalone/projector file like that. It's meant to load a swf file, not a webpage.
Have you tried using a different browser or changing Chrome to use the system copy of Flash Player instead of it's built in version?
Thanks for the reply and the helpful link. The previous version of Chrome that was installed had the two flash versions - and it helped when I disabled the pepper version. However, I seemed to gradually get more lag and freezing / crashing etc, so I did a full system re-install.
I then downloaded the latest Chrome (a few days ago), and this has :
Flash - Version: 184.108.40.206
Shockwave Flash 11.4 r31
Do you think it best to download a separate flash and then disable the one built into Chrome ?
The strange thing about the standalone flash is that I've actually used it before to play the browser game (this was around 6 months ago) !
I have previously used Maxthon browser which has flash built-in, so I might give this another try.
If you have a link to the game's swf, you might still be able to play it with the stand alone/projector version of Flash Player.
As for installing the plugin version (and disabling Chrome's version), I'd say give it a try. You might want to use our 11.5 beta version to see if that helps.
Update - I installed the beta flash and disabled the one built-in to Chrome. The game is more responsive with just occasional lag. The CPU has dropped from 100% continuous down to between 92 - 95%.
For some reason, the beta standalone will not open the flash game. It behaves the same as the stable version.