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

Rex Abert ABERTR at tcc.fl.edu
Fri Sep 12 14:43:59 EDT 2014

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 transactions.  

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 mouse.
My suspicion is that touch devices are not being handled adequately.  

When a mouse is used, the events fired are mousedown, mouseup, and mouseclick.

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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