If you mean POST not working, it helped me to switch to the OS 0.7 syntax, instead of opensocial.makeRequest().
params[gadgets.io.RequestParameters.POST_DATA] = { 'var1': 'val1' };
params[gadgets.io.RequestParameters.METHOD] = gadgets.io.MethodType.POST;
gadgets.io.makeRequest(url, callback, params);
There is the "gadets" syntax, and also the post data is given as an object instead of a string.
I might take the time to point out MySpace made this incompatible, breaking change something like 30hrs before launch, and after their container had been down for many hours leading up to that.