Some reports has problems after Installation Service Pack 5

Greetings,

After the installation Service Pack 5, some reports when exported to Excel give the following error:

File Error: data may have been lost

The report runs well in Infoview but I tried to export in Excel as soon the report starts open give the error. This issue is with some reports. It's the only problem that I got after the installation of Service Pack 5. People, do you have any idea about this issue ?