I've been running the Excel 2007 Beta for quite some time now and this is the
first time this issue has cropped up.

I am no longer able to view any worksheets beyond the first two in any
workbook. When I try, Excel hangs and the zoom slider in the lower-right
corner moves quickly between 82% and 83%.

The files I'm working with were created in Excel 2007 and saved in the 2007
format.

Any ideas?