Sounds like a screen redraw problem.
Do you have sufficient free memory for Excel to redraw its screen?
If yes, does hiding the application and re-show it solve the screen redraw problem?
You can hide the current application by pressing Apple Key + H.
Then, you show the application by clicking its icon in the tray at bottom of screen.
If this solves the problem, I think it's unlikely to be the problem with Excel. It's could be the compatibility problem of the new Mac OS X with your Macintosh model (because you got no problem with your powerbook). You may need to wait for the next Mac OS update to have the problem fixed.
----- Doron Kauper wrote: -----
I'm on a Mac using Panther. I've recently installed to the Office X
10.1.5 update. Shortly after starting work on a large workbook and on
switching from one sheet to another, the sheet display goes blank. All
other operations continue but I can't see them displayed. There are no
scroll bars, no cells, etc. Toolbars, even custom ones, remain intact
and operational.
I've removed preference files and repaired permissions. Any thoughts?
Thanks,
Doron
>> Stay informed about: Blank sheets after 10.1.5 update