If the page is is blank and does not seem to load, try deleting Java Temp Files – go to Windows Control Panel, double-click the Java Icon, under the Temporary Files section is a button to “delete files.” This clears the Java cache.
Next, try and delete internet files by opening your browser and hit CTRL+Shift+Delete. Choose the option for "cache" and/or "temp files." Once those are deleted, try webmail again.
Still getting a blank page? Simply press the "F5" button on your keyboard to refresh the screen.