Cell source not working

Hi ,
for some strange reason the Data Validation - Cell Range function stopped working today.
When I click on the copy source button all is normal
Then when I click on the cell range the list is not populated.
Also if I do the basic =sum( , to start the function when I go to click on the cells to populate it the function just stops and i am put in the cell that I clicked on.
Is the a setting that I have changed that no longer allows the population of cells?

Cheers, Shayne

Hallo
probably bug 168492 – When applying "Cell range" as data validity on a column, I cannot change sheets nor close document nor the app

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