Using MacOS 10.13.6 & Cubase 10.0.40 build 284 & Groove Agent SE5 v5.0.10.99 64bits
Situation A:
When I press arrows of next or previous preset, and next or previous presets are factory presets, everything works fine.
Situation B:
When I press arrows of next or previous preset, and next or previous presets are user presets, I get the error attached:
If I double-click the user preset, the user preset is loaded correctly, no problem.
So the problem just happens when I click the arrows of next-previous preset with user presets.