I too believe it is correct behaviour that open windows (not minimized) should
not display their screenshots. After all, the feature is called
Represent minimized windows by their screenshots.
The problem is that the minimized windows do not always have screenshots but rather have icons. This is
not correct behaviour.
For example, I have 5 minimized applications, 3 FireFox windows, 1 Palm Desktop and 1 Photoshop. Notice from the image below that only the minimized Photoshop window is represented by a screenshot, not the Palm Desktop or any of the 3 FireFox minimized windows. Why that is is anybody's guess - but it is illustrative of the problem/inconsistent behaviour I am identifying here and hoping to find a fix for.

If I then click on one of the FireFox icons to maximize the window and then click on the icon again to minimize it THEN the minimized windows becomes represented by a screenshot. If I do this in turn to the remaining 2 FireFox icons then they too become represented by their screenshots as seen in the image below;

It should be that if a window is minimized it should be represented by a screenshot
without having first to go through the extra steps of opening and then re-minimizing it.
I suspect this is a small glitch and hope that StarDock will take this a a formal bug report and request for a fix in an upcoming release.
I wonder when that might be?
ps: is there a better place to submit a bug report?