Functionality has disappeared from the main screen

Hello,
A chunk of functionality seems to have disappeared. Test Cycles were added. Test cases were imported, etc, all good for a week or so
However now when I log in now,  all of this had gone, the test cases are still there in the backgroud, but the management tools have gone, namely. 
Import Tests

Cycle Summary
Search Execution Filters
Manage Execution Filters
Test Summary
Traceability Matrix