I did still have a Method in the open event of my vertical slider someone wrote here in the forum vertical-slider-broken-under-macos-sierra. It use “NSProcessInfo”. As Xojo does not support Sierra anymore I can remove it.
But it took me some times to see the problem as my application crash just after the debugbuild, or it launch but nothing happened (event infinite loop).
I did a small project with a vertical slider :
VerticalSlider.zip
I didn’t report a bug as I don’t know if Xojo is suppose to show the problem in the debugguer, or, if as we use Declare it should not.
If other people use Declare and have those kind of problem, it may be hard to find.
Note: I run Mojave.