I also have an htc one M7, also ViperOne ROM but have no issues tethering other devices to that device.
now that im reading more thoroughly i missread the question...
i had the same problem on stock, i fixed it by using the second option here: http://forum.xda-developers.com/show...php?p=51786725
you might need to flash the zip too idk since you're in a custom rom, but the script manager thing did the trick for me
Sent from my 831C using xda app-developers app
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