Problems with GUI refresh on macOS

[TobaYn3]

I'm sure that I'm doing something wrong, but at the moment I have absolutely no idea where to start searching.
I totally understand that you won't be able to track the problem without seeing code or being able to reconstruct the problem.
I will try to set up a sample project that shows the problem.

[doublemax]

but at the moment I have absolutely no idea where to start searching.

The first step would be to just recreate the whole layout in a minimal sample. All the panels could be empty or just contain one dummy element, but the window hierarchy including sizers, splitters etc. should be identical.

[TobaYn3]

Yes, I'll give it a try. Thanks!