Could you list the versions (and maybe download links?) for the other libraries you mention in your module file? If there is a bad interaction between GXT and those, it is bound to come up again.
Can you also try a stripped down entrypoint that just adds a single, simple uibinder-based widget to the page, with the module you have now? That is how I will test this case, once I have the right versions for those libs, in lieu of your actual project.
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