Issues upgrading from 1.4.9 to 1.5.2 in iRedMail installation

[dsla]

I'm running roundcube as part of an iRedMail installation.

My issue is that following the upgrade, after login I get the navigation options, but no emails appear. A much whiter screen than normal.

I've followed the instructions to upgrade iRedMail here
https://docs.iredmail.org/upgrade.iredmail.1.3.2-1.4.0.html#upgrade-roundcube-webmail-to-the-latest-stable-release-1411
which leads me here
https://github.com/roundcube/roundcubemail/wiki/Upgrade

My installation of roundcube is standard for iRedMail, with mariadb back end. Hence under /opt/www my structure looks like this:

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lrwxrwxrwx  1 root      root          19 Feb 24 10:05 roundcubemail -> roundcubemail-1.4.9/
drwxr-xr-x 13 root      root        4096 Feb 24 09:47 roundcubemail-1.4.9/


This is what I have done to upgrade (all as root):

Prepare copy of existing roundcube folder, to be updated

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cp -a /opt/www/roundcube-1.4.9 /opt/www/roundcube-1.5.2

Download and unpack the latest complete tarball

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cd ~
wget https://github.com/roundcube/roundcubemail/releases/download/1.5.2/roundcubemail-1.5.2-complete.tar.gz
tar xvzf roundcubemail-1.5.2-complete.tar.gz --no-same-owner

Execute the upgrade

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cd roundcubemail-1.5.2
bin/installto.sh /opt/www/roundcubemail-1.5.2

Link installation to new version

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cd /opt/www
rm roundcubemail && ln -s roundcubemail-1.5.2 roundcubemail

I've been through file ownership and permissions and I think all were installed correctly (basically, everything is root:root except for logs, temp, config/config.inc.php and plugins/password/config.inc.php which are www-data:www-data).

I can see that roundcube is managing to execute sql so the credentials there seem good. But it feels as if it can't retrieve anything from dovecot and I am at a loss to see why...
I've tried restarting dovecot and nginx, to no avail FWIW.

Any pointers gratefully received!

[JohnDoh]

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