regarding your build:
Is it possible that you are using directory / file names containing whitespaces within your project’s qml folder (something like the default one “New folder”)? If yes can you try another build without them? We are working on that issue and a more verbose error output within the next couple of days.
Regarding the update issue: We found the problem and fixed it, thanks for pointing that out. The updates should now be visible for you too, could you please try the SDKMaintenanceTool again?