Quick Access Toolbar. I thought you meant the Tooltip didn't appear.

But it sounds like you are having trouble with the Shift key

Ctrl+ 9 or 0 to Hide
Ctrl+Shift+ 9 or 0 to UNHide

leahl wrote:

I am sorry, Bob, but I don't know what QAT is...??? Remove and re-add what?
Sorry to sound so clueless...