It is possible that there is a bug in the new version(s) but we really need the Windows version, and the Nvidia driver version in order to be able to reproduce the problem, and then fix it. You could also try to run the miner while only listing the available GPUs, then post the results here along with Windows and driver versions:
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I am using WIn10 1709 x64 and Nvidia drivers are 460.89. Now, I am still using Phoenix Miner v5.8b without any issues but when I tried 5.9c and now 6.0c they are not working with same bat file from v5.8b
BR