Varying bug associated with newer Forceware

Every time I’ve upgraded from the 78 series of drivers, I see the same GLSL bug, and I have to downgrade.

I’m writing to a varying mat3 in my vertex shader, but the results are not propagating correctly.

If I replace the varying mat3 with writes to
gl_TexCoord[1…3].xyz, the problem disappears.

I never get an error or warning that I’ve run out of varying variables.

An aside: the 84.xx drivers seem to randomly eventually crash at MakeCurrent calls.

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