Qt Creator loses track of configured kits

[A Former User]

Following the Ubuntu Touch Programming Course (thanks very much @mimecar), I was able to install the SDK (under 16.04), create the sample HelloWorld and WebApp applications, and run them locally on the desktop. However, when I started Qt Creator a second time and opened each of the projects, it stated (under Configure Project) that there were no valid kits. Has anyone else run into this problem? Did I miss something or is this a bug?
Thanks.