- ChroTool window appears not to open
Corrupt registry entry causes window to open off-screen.
FIX or WORKAROUND
Run Regedit (Start > Run > Regedit or Start > [Search box] > Regedit).
Navigate to HKEY_CURRENT_USER\Software\Micromass\ChroTool\WindowSettings.
Delete any subfolders—usually "Normal", but there may be others.
Reopen MassLynx and test.