From one day to another I get the following effect when starting Navigator via Android Auto: The screen stays blank and after a while I get the message "Android Auto does not respond" offering me the options to exit or wait. Selecting "wait" just repeats the procedure.
Maybe related: Just before that issue, Navigator was not always shown in Android Auto's launcher. I didn't find a way to reproduce this, sometimes the app was shown, but most of the times not. When shown, Navigator could be started and was perfectly working via AA. Now, Navigator is again reliably shown in the launcher, but can not be used as described above.
AA: 9.4.631624-release
Navigator: 7.3.26