Need to clean Cache at workstation after update

Need to clean Cache at workstation after update

Strange behavior when not clear the browser cache when modifying a user.
when i want to change a group member ship.

behavior before cleaning cache
add a singel group all group member ships are removed

after cleaning cache a new lay-out of group editing is showing and all works well

can the be a check that shows the user the need of cleaning his or her cache.  

Version 6.5.5 Build 6550
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