For the last few days the 'Save' button has been greyed out in the compose window. I have no idea why; it didn't use to be like that. Otherwise everything is working fine. Any ideas, anyone?
My system is:
Ubuntu 18.04 server (64-bit)
PHP 7.2
mysql provided by MariaDB (mysql Ver 15.1 Distrib 10.1.29-MariaDB)
Postfix+Dovecot
Roundcube 1.3.6