Black fuzzy bars? Graphics issue maybe? HELP

[Fileking]

Im having an issue with kings bounty armoured princess and the expansion. Its kind of weird because it doesnt always happen. Every now and then the bubbles that show the numerical value of items such as rage, how many creatures left, etc... will go into a blank state where all you see is fuzz like a tv without cable. Im using a Nvidia Geforce 8200m graphics card, my screen size is 16:9, resolution is 1366:768. Everything else is fine. Has anyone else had this problem or does anyone know a possible solution?