No Thread Activity to Show (Threads View)
This area shows data about the unhidden threads in the currently visible time range.
If no information is visible, check the following settings:
Is the zoom level high? Try zooming out or scrolling to bring more thread activity in range.
Are too many threads hidden? If so, try showing all threads
If Just My Code is selected, you can only view data about your code. Try clearing the setting to ascertain whether there is any system thread activity.
Make sure that Noise Reduction is set to a low threshold.