Clearing the browser cache will resolve a number of display issues in some web sites, especially Infinite Campus.
CTRL-SHIFT-DELETE key combo will bring up the screen for clearing cache in any browser.
Alternatively, In Firefox -
Click on the Firefox button on upper left of screen - or from Toolbar if it is in view:
Click on History
Clear recent history – set time frame to EVERYTHING
Select the checkboxes for the types of information that you want to remove. (Cookie, Cache, anything else)
Click the ‘clear now’ button.