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 http://www.math.fsu.edu/~rabert/LC/LCscreenshot01.png http://www.math.fsu.edu/~rabert/LC/LCscreenshot02.png 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-boun...@mail.lon-capa.org [lon-capa-users-boun...@mail.lon-capa.org] on behalf of Stuart Raeburn [raeb...@msu.edu] Sent: Thursday, September 11, 2014 9:50 PM To: lon-capa-users@mail.lon-capa.org Subject: Re: [LON-CAPA-users] another instance of correct answer apparently being unaccepted... Doug, 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" <dmi...@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 > dmi...@illinois.edu<mailto:dmi...@illinois.edu> > (217) 244-5739 _______________________________________________ LON-CAPA-users mailing list LON-CAPA-users@mail.lon-capa.org http://mail.lon-capa.org/mailman/listinfo/lon-capa-users _______________________________________________ LON-CAPA-users mailing list LON-CAPA-users@mail.lon-capa.org http://mail.lon-capa.org/mailman/listinfo/lon-capa-users