If I click on the Windows 8 Menu at the top of Start8, then click the top left corner of the screen to go back to the Desktop, the last used minimized application opens instead of showing the Desktop.

This only happens if I use the Windows 8 Menu at the top of Start8. Not if I use the Start8 button.

So, to replicate the problem, open a few programs, then minimize them. Now, go to the Start8 menu and click Windows 8 Menu at the top of Start8.

Now, go to the top left hand corner of the screen and click on the Desktop. Your last used minimized app opens instead of displaying the Desktop.