Does anyone know what causes this?

Technical Support
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Hail,
I am at my wit's end I have tried everything to get around this but the only way is for me to increase my graphics which lowers my fps quite a bit.

Basically just a short distance away from my character the ground textures are a series of multicolored blocks in a large patch.

I am running on an older system and I did not have this issue before MoP hit.
I have provided a link to the issue.

http://imageshack.us/a/img407/9596/wtffc.jpg

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