There are several reasons why no tracks might appear after the Automatic Counting routine has been run, mostly relating to the parameters that need to be set prior to the count being run. If the automatic count appears to run but finishes almost instantaneously it usually indicates that no grains have been selected for counting, that no Region of Interest has been set on each grain, or that the grains have been locked.
If Automatic Counting has been run but no tracks (or any other features) appear in the Overlay, then check the following:
A quick way to check the best values for the minimum and maximum track areas in the Analysis Settings window is to do a trial count on a one or two individual grains using ‘count this grain’ in the pop-up menu that appears when you right-click over that particular grain in the grain list. Once you have succeeded in identifying some tracks you can hover the cursor over each track in the overlay to see its area displayed when the Count Review tool is selected in the Tool Bar. The area is displayed in both pixels and square microns, so you can see the typical sizes present and then adjust the preliminary area cut-off values in Analysis Settings to realistic limits for that sample. Once these have been adjusted to more reasonable values then run the automatic count on all the grains in the sample.