Hi smithpr,

I can see that class correctly work on webworkers (using the same client 6.1.4 on Chrome Firefox and IE) thus I suppose that the problem lies elsewhere.

Do you get any exception on the browser console? Does it say anything in the network tab of the browser console?
How is the <cross_domain_policy> element in the server configuration set?
Which browsers are you testing? (please also specify the version)

HTH