Faced a similar problem. Noticed after a few attempts that the problem is alignment of mouse pointer and actual focus area. Focus area was about 100 pixels right to the actual mouse pointer. It happened mostly with resolutions where vertical resolution was higher than 1024 [1600X1050, 1920X1080].
Although I switched to TPC_beta_v0.8.9_full and didn't see this problem anymore.
Yet to try again the 0.8.9.a and 0.8.9.b addon patches.
LeZoRaZoR
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