Not sure if this is a LR issue or PS issue. Just upgraded LR and PS to 2019. Working on a simple PSD file in Photoshop with about six layers including a gradient layer in the background (red to yellow). After saving and importing the PSD file into Lightroom, Lightroom displays the file with a solid red background (no yellow), as if there's no gradient. Same thing while in the develop module: no gradient. If I flatten the file and resave as a PSD Lightroom displays the file correctly (with the gradient).
Any one else experiencing this?
This is a known Photoshop CC2019 issue. Go into PS Preferences > Performance and check "Legacy Compositing", then save out a new copy.
There is a new layer compositing engine in CC2019 that has been problematic for some (possibly GPU related). Checking that box reverts to the old code.