Worked fine, latest build it's broken in HSL & Tone Curve Panel.
2015.10.1, build 1117303, running OS X 10.11.6 on 2013 Mac Pro (Trashcan).
@adobe Please fix immediately, I have work to do.
Also, it would be nice if I could send this to you (Adobe) directly, instead of a public forum. Your support is leaving me underwhelmed.
Please refer the discussions: LR CC 2015.10.1 Develop module: Soft-proofing mode with Target Adjustment Tools | Photoshop Family Customer Community