Why is Mariner Write crashing on launch?
You may have a corrupt font that is causing the crash. To mitigate this situation please launch FontBook and run the validation on all your fonts. Remove corrupt fonts and try to launch Mariner Write again. Backstory, Mariner Write has a WYSIWYG font menu and we ask the system to draw each font for us - if a font is corrupt it causes the process to fail and crash.