Just upgraded to Photoshop CC 2019 and i'm noticing some display bugs with a range of tools.
My guess is that Adobe has changed the way tools are rendered on-screen (The rectangular marquee selector is now coloured, for instance), but clearly more work needs to be done. These problems persist along a range of iMacs and MacPro's at my office, all are running macOS Mojave and are no older than 5 years.
Below is the system info for my particular iMac

Thank you,
Evert
- The lasso tool doesn't display your selection while drawing. When adding to the selection, you can see the selection you're drawing. The quick work around is draw a small selection and then draw your real selection by shift-dragging. But it's just annoying.
- When using the brush tool you very quickly get a 'spinning balls' cursor, instead of your brush size. This makes precision painting a real pain, as you can no longer see the edge of your brush.
- Then there is the free transform tool. You used to get a bounding box with points around it from where you can drag the different transforms. Now you have to go and guess where to place your cursor to do anything. It makes the transform tool quite unusable. The 'fix' is to turn off graphics acceleration in your preferences, but this used to work just fine in previous versions with GPU acceleration.
My guess is that Adobe has changed the way tools are rendered on-screen (The rectangular marquee selector is now coloured, for instance), but clearly more work needs to be done. These problems persist along a range of iMacs and MacPro's at my office, all are running macOS Mojave and are no older than 5 years.
Below is the system info for my particular iMac

Thank you,
Evert