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JKPieterse 

Hi Jan, thanks for your reply.

I'll confess that I've never used forums like this before but would feel a bit vulnerable sharing my sensitive business data with a complete stranger.

I think the MS support officer suspected corruption which is why he did an Excel 'repair' but it didn't make any difference.

Perhaps you are correct that I'm simply asking too much of Excel. I had it in my head that a small-time user like me would never stretch it to its limits, but perhaps I'm just creating unnecessary complexities through my limited knowledge on how to use it efficiently.

I was hoping someone else my have experienced the same issue and there might be a straightforward fix. Wishful thinking perhaps!