To use the loupe in the new Transform Tool in ACR 9.6 does the GPU need to be enabled? Note that the transform loupe works fine in LR CC 2015.6 without enabling the GPU.
Unfortunately my GPU cannot be enabled in either Lightroom or Camera Raw.
The GPU did need to be enabled in Camera Raw preferences in order for the transform loupe to work. I disabled GPU in my Windows 10 version, and the loupe check box was grayed out. Went back and forth several times to make sure I wasn't overlooking something.
Yes - the Guide Loupe requires that GPU is enabled.
To clarify, the Guide Loupe in ACR requires GPU to be enabled, but the Guide Loupe in Lightroom does not require that. Lightroom would just work fine without the GPU enabled.
This is a limitation of modal nature of the ACR dialog.