I foun this at Autodesk's web site
"When an Excel spreadsheet is pasted, the Picture (metafile) format is used, which can result in the spreadsheet being truncated. This problem can occur when the column width and row height in Excel are set to the default (default width is 8.43, and default height is 12.75), and the pasted object exceeds 18 columns by 70 rows.
Use one or both of these methods to resolve the problem:
Method #1
In Excel, reduce the column width and row height. You can paste more of the spreadsheet if you reduce the column width and row height.
Method #2
Paste the spreadsheet in separate parts. By pasting the spreadsheet in separate parts you can break it down into several smaller OLE objects."