A report runs without issue in HTML format but attempting to run the report in any type of Excel format fails. A temporary solution is to restart the Cognos services.
Error Message:
CM-REQ-4034 An error occurred while reading or formatting data in a property value.
This can be caused if no cm folder exists in the <c8install>\temp directory. You would have to manually create a folder called 'cm' under the Cognos 8 temp directory. Using windows explorer navigate to the c8/temp directory. Create a new folder under this temp directory called cm.