As of yesterday I am unable to preview any of the Java source files in the Canvas SpeedGrader that my students are uploading. These files have a .java extension. I have been able to preview these files ever since we started using Canvas a number of years ago, so this is a recent thing (within the last week or so).

There's no error message, just a blank screen. While the source code never looked great in SpeedGrader, it was still helpful for scanning the submissions quickly. I wonder if anyone else is experiencing this?

Thanks.