I’m not using a normal Apple Keyboard on my Mac. It’s a standard ISO keyboard with a German Layout. Unfortunately this keyboard is not supported by OSX by default. So some keys are not working right. Apple uses some different layout for special characters. So I created my own keyboard layout and installed it on OSX. This is working just fine. I have a symbol in the menubar to switch the layout. This is necessary because I also have the internal keyboard of the MacBook that is using the Apple layout.
The problem is that my layout works fine for most applications. But there a some that keep switching the layout to the Apple default one. For example the Apple Mail App or Parallels Desktop. This drives me nuts: Some applications have a different layout.
In the system setting there is an option for the input source. I set it to “Use the same one in all documents”. But it still changes the layout in Mail. The funny thing is that if Mail is active I can’t switch the keyboard layout manually. I can select it, but it just won’t switch it.
Hope somebody can help me.