Confirm a similar problem. Keyboard layout changes "work" by clicking, in the sense that USA changes to CZE and back. Unfortunately, this has no impact on anything else, I still can not type Czech letters. Then I have to go to keyboard preferences and change something, for example the keyboard type from "Dell" to "Dell USB". Then (1) the keyboard shortcut starts working (2) When the panel says "CZE", I can indeed type Czech letters.
Confirm a similar problem. Keyboard layout changes "work" by clicking, in the sense that USA changes to CZE and back. Unfortunately, this has no impact on anything else, I still can not type Czech letters. Then I have to go to keyboard preferences and change something, for example the keyboard type from "Dell" to "Dell USB". Then (1) the keyboard shortcut starts working (2) When the panel says "CZE", I can indeed type Czech letters.