The Gandalf 6 engine crashes when used as winboard engine under arena. It works fine when used as UCI engine.

Solution:

To use the engine as Winboard engine, the GUI need to pass xboard as command line parameter. See also the readme file. e.g. For use under winboard:
"C:Program FilesWinBoardwinboard.exe" -cp -fcp "f:cgwingandalf60.exe xboard" /fd="f:cgwin" -scp "f:cgwin51prodgandalf51"
/sd="f:cgwin51prod"