There was another update:
dpkg --list | grep grom
ii grommunio-admin-api 1.9.28.774374b-1+46.1 all Backend for grommunio management
ii grommunio-admin-common 6.cb985db-1+2.2 amd64 Common files for grommunio management
ii grommunio-admin-web 2.6.0.43.2feaeef-1+35.1 all Frontend for grommunio management
ii grommunio-common 11.6708625-1+9.1 amd64 Common configuration package for grommunio
ii grommunio-dav 1.1.39.4c06988-1 all grommunio-dav is CalDAV and CardDAV implementation for grommunio.
ii grommunio-error-pages 1.0.6.9c50afb-1+3.1 all Grommunio-branded error pages for webservers
ii grommunio-index 0.1.25.3e826c9-1+31.2 amd64 Generator for grommunio-web search indexes
ii grommunio-sync 1.1.66-0 all an implementation of the ActiveSync protocol which is
ii grommunio-web 3.1.199.62b648d-1+161.1 all Web access for grommunio
ii gromox 2.3.29.96766be-1+28.1 amd64 Groupware server (backend) with RPCH, IMAP and Z-MAPI support
ii mapi-header-php 1.0.17.ff661f9-1+10.1 amd64 Common PHP MAPI header files for grommunio
ii system-user-grommunio 3-1 all System user and group grommunio
ii system-user-gromox 0-1 all System user and group gromox
Ok, this update DID fix the problem.
Thanks a lot!!!