I am having the exact prob
Are you getting any logs in error logs file of Roundcube ?
Code:
Error log: /var/log/plesk-roundcube/errors
I am having the same problem as him, error log here :
tail /var/log/plesk-roundcube/errors
[26-Dec-2013 11:04:47] PHP Warning: date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_config.php on line 435
[26-Dec-2013 11:04:47] PHP Warning: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_session.php on line 132
[26-Dec-2013 11:04:48] PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db.php on line 758
[26-Dec-2013 11:04:48] PHP Warning: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_session.php on line 132
[26-Dec-2013 11:05:01] PHP Warning: date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_config.php on line 435
[26-Dec-2013 11:05:01] PHP Warning: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_session.php on line 132
[26-Dec-2013 11:05:01] PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_session.php on line 662
[26-Dec-2013 11:05:01] PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db.php on line 758
[26-Dec-2013 11:05:15] PHP Warning: date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_config.php on line 435
[26-Dec-2013 11:05:15] PHP Warning: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europe/Moscow' for 'MSK/3.0/no DST' instead in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_db.php on line 758
Not sure what to do :/ I need help please...