Tried incognito, cleared cache, still no suggestion box with the expense I need linked to the invoice.  I just don't get it.  It works sometimes and doesn't other times, and I spend a ridiculous amount of time trying to figure out a work-around.  

I guess I can delete the invoice I want the expense linked to and recreate it, but I should not have to go thru all of that trouble.  So many glitches lately.  I just don't get it.