And the only fix is frequently opening the steam overlay. Odd. Might just be a windows 8.1 thing. Going in and out of the pause menu causes mouse to become non-functional until overlay is opened and closed again. No idea why this is a thing. It has a workaround for now though. Kind of inconvenient, but hey at least it's not totally broken
I bought gta vc, gta 3 and gta sa here and in rockstar launcher, and there was same problem - i start the game, its fine, but after 1-2 minute game just stops to see the mouse, dont react on rmb or lmb. I mean, cursor moves, but it doesnt react on click. I asked about it rockstar support, but all i get was "oh, its strange, but we dont know why it happens". Maybe someone faced such a problem
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