This is a recent error probably since the upgrade to: Moodle 3.9.2 (Build: 20200914)
The code/system has been working fine for multiple
years prior to this.
What is happening is that drag and drop questions which have the font color and background change in the CSS disappear when they are 'placed' by the student/user. Also, there is a side issue of some question prompts not
showing the answer options in the preview.
I've uploaded a video to demonstrate the error here:
The problem was 'resolved' by creating a new style sheet with the color css removed. (See below for the exact info.) Has anyone else encountered this?
Original:
table.thaism tr td {
font-size:1.0em;
text-align: center;
color:#fff;
background-color:#555;
padding:3px;
border:2px solid #ccc;
}
Fixed:
table.thaismdad tr td {
font-size:1.0em;
text-align: center;
padding:3px;
border:2px solid #ccc;
}