I'm getting the following garbled calendar view at Roundcube using elastic skin (Chromium 65 and 66):
Used version(s):
roundcubemail-plugin-kolab_activesync-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-acl-skin-elastic-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-libkolab-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-jqueryui-skin-elastic-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_tags-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-calendar-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_activesync-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_files-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-managesieve-skin-elastic-assets-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_notes-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-tasklist-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_tags-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_delegation-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-acl-skin-elastic-assets-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_delegation-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_addressbook-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-managesieve-skin-elastic-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_files-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-skin-elastic-assets-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-skin-elastic-1.4-47.4.el7.kolab_wf.noarch
roundcubemail-plugin-libkolab-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-calendar-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_notes-skin-elastic-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-kolab_addressbook-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-tasklist-skin-elastic-assets-3.4-39.4.el7.kolab_wf.noarch
roundcubemail-plugin-jqueryui-skin-elastic-assets-1.4-47.4.el7.kolab_wf.noarch
(moved from https://github.com/roundcube/roundcubemail/issues/6375, creating a "bug report" failed with: Task priority "60" is not a valid task priority. Use a priority keyword to choose a task priority: unbreak, triage, high, normal, low, wish.)