[Kolab-devel] Debian9/Winterfell: Send mail with roundcube?

I've updated my webfrontend to Debian9 and current Kolab Winterfell.
Roundcube is the release 1:1.3.0-0~kolab1.

After composing a mail and hitting "send" or "save" nothing
happens. I've looked around for error messages in /var/log/roundcube
oder apache, but found nothing. Any idea where to look?

I'm still using the larry theme, but I can't send mails with the kolab
theme. So I suspect a bug in the last roundcube update. Any ideas?

Jochen

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