Hi,

I am using Office 2007 and I have noticed something strange. My workbook is
quite simple and not very large (300KB). In the most busy spreadsheet, I am
using vlookup about 700 times and there are about 1500 cells with drop down
boxes - it is a data collection tool where some of the answers are pre-filled.

Sometimes non-empty cells, even those with text only in them, will appear to
be empty and you need to click in them or move around the spreadsheet before
their content becomes visible again. Any ideas on what is doing this?
Needless to say, the user will not be guided properly if they can not see the
instructions.

Thank you very very much for giving me a hand!