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<t>After I updated my video drivers I had this problem as well. I have both 4 and 5 installed and was using 4 so I could force aa. Tried the uninstall/reinstall of trackir and nvidia drivers, nothing worked. I just got 5 working again with nvidia settings in place by exiting and restarting it minimi...

Shutting down tir-5 and reinstalling 190.62, as suggested in the other thread, fixed it for me.