Graphical Glitch with firestorm

]This glitch was seen with the firestorm coming off a totem in Fellshrine ruins, as I had initially forgotten how to take a screenshot /debug information did not make it into the picture.

I was unable to recreate the glitch subsequently. Though I have seen similar glitches happening in the Ancient Pyramid, with the particle effects of the totems 'flaring' up and taking over the entire screen making it impossible to see what was happening on the screen. The Glitch is non-catastrophic and usually resolves itself after a while.

The Glitch seems to somehow involve the shadow effects as the shadows in the scene continued to be glitchy even when firestorm was not active.

EDIT:

System specs:
Intel Core i5-3570k
GeForce GTX550 Ti on latest nVidia driver.
Windows 7 SP1 64-bit



Sorry about the huge size of the image.