--- a/mod/assign/feedback/editpdf/locallib.php
+++ b/mod/assign/feedback/editpdf/locallib.php
@@ -332,11 +332,34 @@
     }
 
     /**
+     * Pre-check to determine whether we (Unil) thinks we should use annotation
+     * If the user is using the editpdfplus submission plugin (capability check),
+     * deactivate annotation (from $this plugin).
+     *
+     * @return bool activate or not
+     */
+    private function is_enabled_precheck() {
+        global $CFG;
+        if (file_exists($CFG->dirroot . '/mod/assign/feedback/editpdfplus/version.php')) {
+            if ($this->assignment->get_context()) {
+                return !has_capability('assignfeedback/editpdfplus:use', $this->assignment->get_context(), null, false);
+            }
+        }
+        return true;
+    }
+
+    /**
      * Determine if ghostscript is available and working.
      *
      * @return bool
      */
     public function is_enabled() {
+        if (!$this->is_enabled_precheck()) {
+            return false;
+        }
         if ($this->enabledcache === null) {
             $testpath = assignfeedback_editpdf\pdf::test_gs_path(false);
             $this->enabledcache = ($testpath->status == assignfeedback_editpdf\pdf::GSPATH_OK);