Changed in release 2.55 (25th January 2026)
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General system :

  o Versions of XL Designer prior to v2.22 had the facility to define limited CNC router information from
    within the board profile editor.  With the introduction of the slots/extra holes facility from v2.22 onwards,
    this legacy router information became automatically converted into slots/extra hole features within the artwork.

    From this release onwards, this automatic conversion is disabled by default, but may be re-enabled if desired
    from within the File->System Setup dialog.  The option may be found in the 'Design File Options' section of
    the setup dialog.

NC Drill & Rout output tool :

  o BUGFIX: Invalid Gerber/RS-274X router paths were being generated when the path contained a mixture of straight
    lines and curves. (failure to revert to linear interpolation mode after use of circular interpolation)