At first that didn’t work. Still crashed.
So I uninstalled and removed the settings folder (the path you specified above, but the whole folder this time), and installed it again and updated it to 10.0.5 (build 25).
Again it crashed when going to those settings.
Then I tried setting it with another soundcard and then it did not crash when going to the setting.
So now I have changed what you said I should change (and I even toggled the other settings to make sure they were stored), and now the loop markers work in Omnipshere.
So thank you very much.