Basically, the new Ext 1.1 uses YUI's 'disableCaching' feature so that IE won't return stale JSON results. They do this by always including a bogus parameter called _dc in the JSON request, set to the current time, so that each JSON request will be unique and never trigger IE's caching. Other browsers just don't cache JSON so it's not a problem. Anyways, so most JSON queries are coming in now with this extra parameter, and TG was throwing an 'unexpected parameter' exception, which we turn off by setting tg.strict_parameters to False.
