Update All (Cntrl A) Does Not Work

pom15595

For some reason I cannot seem to update fields (eg table / figure numbers) by
selecting the whole document using control A, then F9.

I can update these fields if I individually hightlight them or even if I
select/ highlight a section of the document that contains a field, but not
via control A.

This used to work, but seems not now.

Any ideas?