[LON-CAPA-users] another instance of correct answer apparently being unaccepted...

Mills, Douglas G dmills at illinois.edu
Mon Sep 15 12:22:51 EDT 2014

The two students who got back to me on my follow-up question about this
both report having been using a touchpad on their laptop when the problem


Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmills at illinois.edu
(217) 244-5739

On 9/12/14, 1:43 PM, "Rex Abert" <ABERTR at tcc.fl.edu> wrote:

>I have been experiencing similar situations, and I'd like to throw in my
>2 cents.  For me, I was getting internal errors (bombs) when a student
>submitted a correct response.  I would see a submission that is graded
>correct, followed by another submission causing the error.  What I
>noticed from Doug's and mine is the identical time stamp on the offending
>I have place screenshots at
>I asked the student if she was using a mobile device, and she replied
>that is was a laptop, but that she was using the touchpad instead of the
>My suspicion is that touch devices are not being handled adequately.
>When a mouse is used, the events fired are mousedown, mouseup, and
>With a touch device, the events touchstart, touchmove, and touchend are
>fired in addition to the mouse events.  I'd wager that the "touchmove" is
>what is causing a different option for Doug's student to be selected in
>addition to the correct selection.
>I hope that this speculation might turn out to be useful.
>Rex Abert
>Assistant Professor of Mathematics
>Tallahassee Community College
>From: lon-capa-users-bounces at mail.lon-capa.org
>[lon-capa-users-bounces at mail.lon-capa.org] on behalf of Stuart Raeburn
>[raeburn at msu.edu]
>Sent: Thursday, September 11, 2014 9:50 PM
>To: lon-capa-users at mail.lon-capa.org
>Subject: Re: [LON-CAPA-users] another instance of correct answer
>apparently      being unaccepted...
>I have added you to bug 6740, which was filed for a similar situation
>in a different domain. Note: that bug is only visible to
>bugs.loncapa.org users explicitly included as a CC, reporter or a
>developer since it includes some student information.
>You may want to copy the screenshots you uploaded to
>https://uofi.box.com/ and linked to in your two posts to the
>lon-capa-users mailing lists to that bug report as attachments.
>Stuart Raeburn
>LON-CAPA Academic Consortium
>Quoting "Mills, Douglas G" <dmills at illinois.edu>:
>> Hi All,
>> I've amassed as much data as I know how to amass on this situation
>> which has occurred now with a different student. Here's what I have:
>> Looking at his "scores per problem" view via the Course Progress
>> interface, it appears that he has credit for all 15 questions:
>> https://uofi.box.com/s/cn7vrpqyenp1zr7owke9
>> Clicking on the links to view his actual submissions, however,
>> indicates that question 15 is currently wrong. Here's a screenshot
>> of that with the previous tries dialogue up where you can see that
>> his second attempt was graded as CORRECT:
>> https://uofi.box.com/s/a17kkg1mfk2029k9kgpz
>> Here I scroll down the page and look at his submissions for this
>> part. I see an incorrect submission, what appears to be a
>> non-submission -- the date and time are there but no other details,
>> the submission judged as "exact_ans" and then one evaluated ad
>> "incorrect."  Note also that these two latter submissions are both
>> listed as Trial: 2. Then there are several more "non-submissions" --
>>  dates are there, but no other information.   Not in the screen shot
>>  there are a couple other parts submitted next, then several more of
>>  these non-submissions:
>> https://uofi.box.com/s/hdttef80s3d8sn1ueqfr
>> And finally here is where I click as if to manually assign grades to
>>  this student.  Part 41 is the part in question. You see here that
>> it  shows part 41 as currently being awarded 1 point (if I
>> understand  that correctly) but NOT having the red checkmark next to
>> it under  weight.  Thinking perhaps I can override, I went ahead and
>> saved  this as if I had awarded 1 point but that did not change
>> anything  when I came back to the student.
>> https://uofi.box.com/s/0ogcwvdze360djbk89np
>> This is especially irksome because it has occurred on our prelab0
>> and Safety quiz which is has to be completed before anything else in
>>  the course can be accessed. The student is stuck, I think as
>> represented by all the "non-submissions" now showing . I 'll next
>> try resetting the problem and hopefully he can then successfully
>> complete it, but I wanted to document what we're seeing here first.
>> Any thoughts?  Is there somewhere I should be pulling a more
>> thorough report of what has transpired from?
>> Doug
>> Douglas Mills
>> Director of Instructional Technologies
>> Department of Chemistry
>> University of Illinois
>> dmills at illinois.edu<mailto:dmills at illinois.edu>
>> (217) 244-5739
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