A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Sorry about the huge delay in replying, the last few times I tried to access the thread I was getting page not found!
Nice to know someone else has the problem and it's not just me. In the meantime I've found that I can navigate the sheets one at a time using Command+PgUp/PgDn. It's not perfect, but it'll do for now.