When you try to move a multichoice question using the Move icon, after changing the category and pressing the Move Question(s) button an error is displayed for the Choice 1 grade item of the form : One of the choices should be 100%, so that it is possible to get a full grade for this question. 100%

Additionnaly 2 errors are displayed if debugging is activated:
Notice: Undefined index: answer in C:\wamp\www\moodle_test23\question\type\multichoice\edit_multichoice_form.php on line 103
Warning: Invalid argument supplied for foreach() in C:\wamp\www\moodle_test23\question\type\multichoice\edit_multichoice_form.php on line 109