Call glProgramStringARB with instruction EX2, then draw a point, the result texture got in feedback mode is incorrect.
Created attachment 9922 [details] test case
The problem was texcoords returned by feedback were getting divided by Q, i.e. (s/q, t/q, r/q, 1.0). Evidently, that's incorrect and texcoords should be returned unprojected. Fixed in git.
Oh, one other comment about your test program. The vertex program doesn't write to 'result.position'. Off-hand I don't recall what the GL_ARB_v_p spec says about that, but if the position is undefined, the vertex/GL_POINT may get clipped away and produce no feedback at all.
Mass version move, cvs -> git
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