It was mentioned by Saga Musix that "The compressed pattern data may not exceed 65535 bytes. This is exactly why the warning is shown." However, creating a blank pattern containing 1,024 rows in a 106 channel module is 636 kibibytes (or kilobytes, either way is much larger than 65,535 bytes) in size. That, however, does not display the loss of data warning or cause data loss. Readdressing the bug with rows should be considered. Alternatively, if pattern data is intended to be limited to 65,535 bytes, then the number of allowed channels and / or rows should be reduced. Perhaps the size shown in the Pattern Properties dialog is incorrect.