That's not really a solution. My issue is not so much the presence of the uncloseable start window as the fact that windows generally don't close and the UI is not responding to the most basic of commands. This is such a major regression that it makes me question the quality of the testing that went into a product used for testing.
I question how 5.6.0 got past basic QA. Literally the first thing a new user would do is close the Startup window. And it doesn't work. What sort of first impression does this give for "The World's Most Popular API Testing Tool" ?