Photoshop CC and Lightroom 5. In Lightroom choose "Edit in" and "Merge to HDR Pro in Photoshop". Select 32 bit in HDR Pro and selection available is "Tone in ACR". When selected the image is presented in Camera Raw. The only choices afterward are "Cancel" or "Okay". Return to Photoshop is blank desktop and no toolbars and no image. If you select "Save" the invisible HDR image is saved back to Lightroom but the photoshop desktop is not useable and you must quit Photoshop and re-launch. Previous Photoshop CS6 round trip with this function worked just fine.