Camera Calibration Tool (for mixed reality) seems broken with 1.27 update (6/12/18)

Just curious if anyone else is doing mixed reality capture and have encountered problems with the latest update. I had to move and re-calibrate my camera (using the CameraTool.exe utility app). The marker detection portion works fine. But I can no longer tag the placement of the headset - it appears the buttons on the Touch controllers are not being recognized (neither X or A buttons do anything). When you look inside the headset, it also appears the CameraTool app is hanging up the Rift - and all you see is the generic app load screen with the words "Loading...."

I realize very few people probably use the mixed reality features, but if so, I'd love to hear if it's working for you.