Corrupt textures in the world editor since 1.13 patch?

Since the 1.13 patch i've been noticing a lot of corrupt textures would happen here and there. For example sometimes my terrain goes all crazy with colors and if I minimize the world editor and re-maximize it , it gets fixed. Last time some of the grass in my terrain turned into a perfect mud texture that wasn't even in my tileset.

Now normally I wouldn't care since it's such an easy workaround by just minimizing the editor but the editor seems to also slow down a lot after i've had it open.

Anyone else experienced this since the 1.13 or possibly before?

My video card is an ATI Radeon 9700 Pro w/ 128MB Ram w/ 3.1 Catalyst drivers.