Cant seem to get a custom launcher to stick since I updated to Marshmellow

Anyone else have this problem or know of a fix? I can hit the Nova app icon and it will set it the launcher. However, as soon as I hit the home button it reverts back to default. Additionally when in Nova Settings, I tap the header that says tap to set Nova as default launcher, for a half second it acts like it is bringing up another screen momentarily but then stays on the main settings screen. It does the same thing when I scroll down to the Select Default Home where currently Huawei Home is set. I have tried other launchers additional to Nova including: Google Now, TSF, and Smart Launcher. I am currently running the latest update of Nova Launcher Prime 4.3.1, on a GEM-703L, running Android 6.0.

Thanks for any help.

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