Default SM-N900W8 + CM11 + ART = Not Enabling

I was hoping I could play around with ART this weekend on my Note 3 with CM11 M7 but it won't even enable, I've enabled Dev Options, changed runtime from Dalvik to ART, reboots, and then starts up only a few seconds later back using Dalvik (where as ART should take a few minutes to convert apps over to its runtime)

Any ideas why it won't switch over?
Samsung Galaxy S3 - Model: SGH-I747/M - ROM: CyanogenMod 11 Nightlies - Kernel: Stock - Storage: 16GB + 64GB SDXC
Samsung Galaxy Note 3 - Model: SM-N900W8 - ROM: Rooted TW 4.3 - Kernel: Stock - Storage: 32GB + 64GB SDXC - KNOX: 0x1
Samsung Galaxy Note 3 - Model: SM-N900W8 - ROM: CyanogenMod 11 M8 - Kernel: Stock - Storage: 32GB + 64GB SDXC - KNOX: 0x0