SpeedGrader Preview not showing Excel Histograms

[ChristianCrane]

In Canvas SpeedGrader isn't showing bar graphs/histograms in uploaded Excel documents in the preview window. However, line charts show up fine in the preview window. I'm uncertain if this is a new issue or existing concern. 

Any assistance would be appreciated. 

[wjames]

We have a similar issue with Microsoft LTI (Cloud Assignment) Excel Histograms.

Student Excel submission DO display the histogram, but bin-width changes do not propagate with the submitted file.

Image 1: Histogram from Excel file, located in LTI SharePoint Student Submission Folder.
This is what we expect to be displayed in SpeedGrader (bin width set to 3.3).

Image 2: Actual Speedgrader submission (bin width re-set to "Auto"?) 

This occurred for ALL student submissions.

Not sure if this is an LTI issue, SpeedGrader Issue, or Excel 365 issue.

Any suggestions?

[JohnWhitefoot]

I've noticed just this fall that Excel functions often do not calculate in Speedgrader and wonder if this is a related issue. Basic cells show fine, but (for example) using the t.dist() command will show up as "#NAME?" in the preview. Downloading the file and it looks fine. I've been giving assignments like this for many years, so this is a new change I'm seeing.

This definitely takes the speediness out of Speedgrader, having to download each file 😕

[Seangt]

we're seeing the same thing, student submissions will be correct, but Canvas' DocViewer will display "#NUM!" errors instead of the result of functions sometimes. Makes it hard to teachers to grade things.