This may have to do with ODF documents that have been created by conversion from another format. I copied the contents of an offending .ods spreadsheet to a new blank .ods file and this file opened from Ubuntu's Recent Documents with no problem.
This may have to do with ODF documents that have been created by conversion from another format. I copied the contents of an offending .ods spreadsheet to a new blank .ods file and this file opened from Ubuntu's Recent Documents with no problem.