To reproduce:

1. Start Qt Creator
2. Go to welcome screen and click on any example (e.g. samegame will do). It will show the help page associated with it (if any) and it will parse the source files. Close the help page. While parsing the source files it will show a busy cursor (spinning blue circle on windows) ).
3. Wait for the parsing to finish.
4. Wait for the busy cursor to become "unbusy". (This never happens it seems)

You can also click on "Configure Project". This will configure it and it doesn't seem to be very busy afterall.

For me it seems that the busy cursor is just not restored back to normal when its not busy.