Since I updated to 7.2 release, I've been having problems with the adjustment brush and the brushes in the gradient & radial tools. When I brush in an area, it takes forever (sometimes 30 seconds or more) to show the adjustment. I've tried showing the overlay and not having it visible—no difference. Sometimes, the beachball spins for a while and nothing has happened—I have to brush the area again. This is the most frustrating thing I can imagine. It took me almost an hour to make adjustments to an image that should have taken me 2 or 3 minutes at the most. On this one, I had zoomed in to clean up the gradient filter. Another issue: When I was going through images at full size using the arrow keys to move to the next one in the film strip, sometimes the keys would stop working. I had to go back to Grid view, click on what I wanted and start again. After a while, the arrow keys stopped working again. I restarted the Mac but the problem remained. 22438 images on an internal HD, not the one with the system on it. In Prefs, Camera Raw Cache set to 20.0Gb maximum size. Tried turning off "Use Graphics Processor" which made no difference. What's up with this? Please HELP!!!! System Info: Lightroom Classic version: 7.2 [ 1156743 ] License: Creative Cloud Language setting: en Operating system: Mac OS 10 Version: 10.11.6 [15G19009] Application architecture: x64 Logical processor count: 16 Processor speed: 2.4 GHz Built-in memory: 20,480.0 MB Real memory available to Lightroom: 20,480.0 MB Real memory used by Lightroom: 7,917.2 MB (38.6%) Virtual memory used by Lightroom: 12,037.1 MB Memory cache size: 770.8MB Internal Camera Raw revision: 894 Maximum thread count used by Camera Raw: 5 Camera Raw SIMD optimization: SSE2 Camera Raw virtual memory: 1503MB / 10239MB (14%) Camera Raw real memory: 1543MB / 20480MB (7%) Displays: 1) 2560x1600 Graphics Processor Info: OpenGL: ATI Radeon HD 5770 OpenGL Engine Check OpenGL support: Passed Vendor: ATI Technologies Inc. Version: 4.1 ATI-1.42.15 Renderer: ATI Radeon HD 5770 OpenGL Engine LanguageVersion: 4.10 Total Video Memory: 1024 MB Application folder: /Applications/Adobe Lightroom Classic CC Library Path: /Users/lem/Pictures/LR6 catalog/LR6 catalog-2-2.lrcat Settings Folder: /Users/lem/Library/Application Support/Adobe/Lightroom Installed Plugins: 1) AdobeStock 2) Aperture/iPhoto Importer Plug-in 3) Canon Tether Plugin 4) Facebook 5) Flickr 6) HDR Efex Pro 2 7) Nikon Tether Plugin 8) ON1 Effects 10 9) ON1 Enhance 10 10) ON1 Photo 10 11) ON1 Portrait 10 12) ON1 Resize 10 13) Perfect B&&W 8 14) Perfect Effects 8 15) Perfect Effects 9 16) Perfect Enhance 8 17) Perfect Photo Suite 8 18) Perfect Portrait 8 19) Perfect Resize 8 20) Perfect Resize 9 Config.lua flags: None AudioDeviceIOBlockSize: 512 AudioDeviceName: Built-in Line Output AudioDeviceNumberOfChannels: 2 AudioDeviceSampleRate: 44100 Build: 10.0x7 CoreImage: true GL_ACCUM_ALPHA_BITS: 0 GL_ACCUM_BLUE_BITS: 0 GL_ACCUM_GREEN_BITS: 0 GL_ACCUM_RED_BITS: 0 GL_ALPHA_BITS: 8 GL_BLUE_BITS: 8 GL_DEPTH_BITS: 24 GL_GREEN_BITS: 8 GL_MAX_3D_TEXTURE_SIZE: 16384 GL_MAX_TEXTURE_SIZE: 16384 GL_MAX_TEXTURE_UNITS: 8 GL_MAX_VIEWPORT_DIMS: 16384,16384 GL_RED_BITS: 8 GL_RENDERER: ATI Radeon HD 5770 OpenGL Engine GL_SHADING_LANGUAGE_VERSION: 1.20 GL_STENCIL_BITS: 8 GL_VENDOR: ATI Technologies Inc. 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