Samsung Galaxy S4 i9505 stuck on boot loading screen after flashing SuperSU

My SGS4 i9505 (Intl.) is running CyanogenMod 13.0, specifically cm-13.0-20160114-NIGHTLY-jfltexx with Gapps flashed.
I also have TWRP 2.8.7 installed on Recovery.
My phone had been working perfectly until this evening. I opened SuperSU app (which I downloaded from Play Store) and a message popped up saying i had to install SuperSU binary Normally or using TWRP/CWM. Normal Install popped up an error message, so I downloaded the zip from download.chainfire.eu (UPDATE-SuperSU-v2.46). Then saved it on my SD card and flashed it through TWRP.
After the installation-flashing was complete, I tapped on Reboot->System and since then I am stuck on loading screen.
Is there a way to undo the flashing (Don't care about SU, just want my data unharmed)?
What did I do wrong so as to avoid doing it next time?
Please help as soon as possible,
Thanks in advance.

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No sound & some games only loading their launchers

The First time i open a game the sound usually works. But if I quit and open another it won't work and either has no sound, or super stuttering sound then drops.

Also, the controller only works in games like team fortress 2 hl2, cs go, etc once in actually in the game. Also games like far cry 3 simply load u play, but don't actually launch the game.

Shield TV + windows 10 660 ti
I updated sound card too.

I'm pretty sure that I'm on the newest beta version, but I'm not what version is the newest for both the shield android app and the GeForce experience?

Is there anything else I can try? I'd really like to get this working.

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