Please make sure you are using the latest drivers provided by your video card manufacturer: ATI, nVidia

---

Please verify that you have the latest Service Pack for your Operating System installed (Windows Vista SP1, Windows XP SP3): http://windowsupdate.microsoft.com/ 

---

Another user reported the following fixed his issue on Windows 7: "After going into the resolution settings for the display and clicking detect, and then ok, the MuvUnder Cover window displayed.

---

If the above solutions still don't correct the issue, you can try updating your version of DirectX.

http://www.microsoft.com/downloads/details.aspx?FamilyID=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en

---

Finally, some users have reported that restarting their computer does the trick.