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JopSchouten
Community Member

Minus signs disappear in Quizzes

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Problem: in several different Quizzes, the minus signs in my Math equation disappear. The problem occurs randomly on different computers, different days and even on the same day, same webbrowser, it can differ whether you can see the minus sign or not.

I use the Formula Editor to copy my LaTeX math equations. See below for a screenshot: the minus sign is missing, while it is inserted in the math equation: \int_{ -1 }. It also happen with more simple equations...

I hope one of you can help me to solve this issue! It is really important that I can trust the Formula Editor and that students see the same things while making their exams!

Thanks!

Minteken bug Canvas.PNG

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19 Replies
kaw
Community Participant

I do not think that will help.  You will have to tell all students to do it. Using \textbf helped.

IamEnigma
Community Member

The "solution" of zooming your screen doesn't solve the issue for the students in all cases.

A better workaround is to consider that the equation once placed in the rce is an image. Simply grab one corner and make the image slightly larger and the negative signs will appear for you and for your audience.

cdavis1921
Community Participant

I have used the Wiris Chem editor in my Canvas courses to enter equations, polyatomic ions, etc. The app is available in the app list in course settings. I haven’t received any reports from students about negative/minus signs not appearing.

http://www.wiris.com/solutions/chemistry

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KOliveras
Community Participant

Try updating Chrome to version 88 (recently released).  This may be related to a bug in Chrome where certain svg lines were not rendering correctly.  I was experienceing this issue over the last few weeks and updated my browser yesterday.  The minus signs seem to have reappeared.  Yay!

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kaw
Community Participant

That worked. Thank you. Now I am going to tell my students and I hope they all do so.

Update Chrome

Update Chrome as the older versions may not render some equations correctly. This is critical for the online tests.

Go to the three dots at the top right corner.
Click on Help
Click on About Google Chrome.

OR See Method 1 for visual help on doing this https://www.wikihow.com/Update-Google-Chrome

It will start updating by itself.

warren_goetzel
Community Participant

Our CSM said to be sure all of us send a ticket to support. 

ptart
Community Participant

Need some help as we are still having issues with this. I also have an open ticket with Canvas support. Many of our math courses push content and quizzes from blueprint courses impacting thousands of courses. Also, our district (K-12) has thousands of managed Chromebooks which impacts the following:

  • Other browsers are not an option.
  • We do not want to advise students K-12 students tinker with the hardware acceleration flags in the settings.
  • Disabling hardware acceleration may mess up more than it will fix.
  • With almost 180K students, we are cautiously slow to roll out new versions of Chrome. We are on 86 and testing 87.

Any advice would be great.

Thanks

ptart
Community Participant

Do we know exactly which versions of Chrome are impacted? Our district (K12) has thousands of managed Chromebooks on 86. We are just now testing 87 so 88 is not an option.
Thanks

ptart
Community Participant

I have found that changing the browser zoom setting will display the negative symbols correctly. In my testing, the following zoom percentages show correctly: 67%, 75%, 110%, and 125%. I am not sure how a student would know to zoom or not since they never see the negative symbol in the first place, but at least this is an option.

KOliveras
Community Participant

@ptart I'm not 100% sure, but I believe that the bug was reintroduced in Chrome 87, and corrected with Chrome 88.  I believe that Chrome 86 should be fine, but again, I'm not 100% sure.  Here are a few relavent threads on the underlying issues: 

https://github.com/mathjax/MathJax/issues/2612

https://bugs.chromium.org/p/chromium/issues/detail?id=1159852

That said, this may no longer be an issue with the Feb 20 update.  The new mathjax integration seems to default to outputting math via a common html css file as opposed to using svg (which was causing the problem).  In short, I hope that your issues have gone away with the new update.