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Have an empty Include in Install list in step 2 of AU wizard. Add a single module and remove it by double-click on the module in the list. The list is empty now but buttons for remove and remove all are enabled. By analogy when the list of Available Updates is empty and you add some module there by double clicking a module(removing some module from Include in Install to Available Updates) then buttons Add and Add All should become enabled.
Fixed in main trunk.
Resolved for 3.3.x or earlier, no new info since then -> closing.