This conversation has been merged. Please reference the main conversation: Lightroom: Can't expand crop size when displayed crop angle is 0.00
Here's a screen capture illustrating the bug: https://dl.dropboxusercontent.com/u/21811200/crop-bug.2017.06.30.mov. At the end, I show that the internal CropAngle value is 0.001337, which gets rounded to 0.00 in the Crop tool.
The workaround is simple, once you know it: Either double-click on the slider pointer, or click on the numeric angle and type 0 followed by return.
Note: This conversation was created from a reply on: Can't expand crop area in Lightroom.