Ok, but if contractUpdate is not loading a chain from IB, can you let us know how you achieved that, with which asset, and preferably with some code? There are many working examples of contractUpdate in the manual.

You know your script, but we don't. So, if something does not work in the beta version, it's a bit difficult for us to guess what in your code might have caused the problem. Same for MaxRequests and generally for anything that does "not work" - since it normally works anywhere else, we need a bit more details about that problem and how or when it happens.