At that point it should be trying to get the task lisk from sbt, which usually only takes a couple of seconds. If sbt doesn't already have the version of scala pinned in the generated build.sbt file, it may download those dependencies here too. While it shouldn't make the UI lock up, with the current design, we are stuck waiting for the task list, as we need that to be able to generate the project files.
Did you have to kill SlickEdit? If not, is there anything in the Output tab?
What happens if you go to the command line, cd to your project directory, and run this: sbt -J-Djline.terminal=None tasks -V Does it complete, and what is the output you get from it?
