Maybe try doing a command-A to select your entire workbook, followed by command-C to copy it, and then command-V to paste it into a newly created workbook?
I think I had the same problem once, and that may be how I fixed it.
Also, have you tried deleting the empty lines at the bottom of your workbook?
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
