SDP 8.1 styling problems

SDP 8.1 styling problems

Since upgrading to ServiceDesk 8.1 I have had some issues with the styling of the pages.  I initially resolved this using Ctrl+F5 to clear the cache but now it has happened again - the buttons for each module are not showing  There are also HTML tags appearing in service catalogue template descriptions, as shown in the screenshot below.
 
 

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