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Clear your cached student pictures

Click on the three parallel bars in the top right corner of your browser window  

Then in the drop down menu select more tools -> Clear browsing data

This will open up a settings window to clear your browsing data.  From here select Obliterate the following items from: "The beginning of time"
 and check the box for Cached images and files. You can select more items like cookies and history if you wish, then click Clear browsing data.

From here all old student pictures should be replaced in synergy.