Hi Guillaume:
The problem is that the Responsive Theme is not compatible with versions starting with 4.2.
The developer has not updated it and it seems that he has no intention of doing so in the short term.
I solved it by adding custom CSS code. The images are taken from a previous version that I saved
.activity-item .activity-grid {
display: flex!important;
}
.flex-column {
flex-grow: 1;
}
.modtype_forum .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/forum/icon.svg);
}
.modtype_assign .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/assign/icon.svg);
}
.modtype_attendanceregister .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/attendance/icon.svg);
}
.modtype_page .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/page/icon.svg);
}
.modtype_resource .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/resource/icon.svg);
}
.modtype_quiz .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/quiz/icon.svg);
}
.modtype_quiz .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/quiz/icon.svg);
}
.modtype_url .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/url/icon.svg);
}
.modtype_scorm .courseicon .activityicon{
content: url(/theme/adaptable/pix_plugins/mod/scorm/icon.svg);
Hope this can help you
Carlos.