In any case, I do not recall any complaints of your particular abnormality, nor have I experienced this with any versions of Sound Forge Pro. There have been comments about small menu text and icons on high-resolution monitors (see thead), but no pixelated display issues I can recall, Try resetting SF to the default factory settings (File> Reset All preferences and catched data).. or uninstall > reinstall, using a third-party uninstaller or cleaning left-over folders, data and reg entries prior to reinstall.
The screenshot looks fine to me, and I even even enlarged it some, but my eyes ain't all that great so third-party opinion would be nice. Do other applications exhibit the same odd behavior. If it is just SF, try a reset or a uninstall-reinstall..