After you disconnect from the docking station and start the game, if you switch it to windowed mode in the graphics options and exit, it should remain that way if you try starting it again when docked.
Please email supportdos2@larian.com (or post/PM) with the rest of your system specs (you can use the 'System Report' button from the 'About This Mac' Apple menu item, or the 'System Information' app in the utilities folder), including the OS version number.
Also include a crash report (collected in the 'Console' application, under 'User Reports'), or Dropbox or Google drive link, etc. Alternately, the crash reports may be saved in the '~/Library/Logs/DiagnosticReports' or '~/Library/Logs/CrashReporter' folders.