Annotation layer not redisplaying on zoom-in

[ANDERSON, WALTER]

I am having a problem with labels on an annotation layer displaying on
the full extents but not displaying when I zoom in.  The problem is with
the "Route Labels" layer in the map file below.  The labels (with shield
symbols) shows up fine when the map is zoomed to full extent, but they
disappear whenever any level of zoom-in is made.
 
Can someone tell me what I am doing wrong?
 
I am currently testing this map on the latest ms4w mapserver build and
using the maplab tool to preview the map.
 
Thanks,
 
Walter Anderson
 
MAP
  NAME "Highway"
  STATUS ON
  EXTENT 2560000 9840000 3465000 10348500 
  SIZE 600 400 
  SHAPEPATH "/ms4w/apps/hba/data/"
  SYMBOLSET "/ms4w/apps/hba/htdocs/symbols.sym"
  FONTSET "/ms4w/apps/hba/htdocs/fontset.txt"
  IMAGETYPE JPEG
  IMAGECOLOR 255 255 255
  UNITS FEET
  WEB
    IMAGEPATH "/ms4w/tmp/ms_tmp/"
    IMAGEURL "/ms_tmp/"
    LOG "/ms4w/apps/hba/err.log"
  END
  REFERENCE
    STATUS ON
    IMAGE "/ms4w/apps/hba/data/austin_district.gif"
    SIZE 304 174 
    EXTENT 2519285.568276 9809279.856313 3508398.761244 10375938.133188 
    COLOR -1 -1 -1
    OUTLINECOLOR 255 0 0
  END
  SCALEBAR
    STATUS EMBED
    COLOR 0 0 0
    OUTLINECOLOR 0 0 0
    BACKGROUNDCOLOR 255 255 255
    IMAGECOLOR 255 255 255
    UNITS MILES
    INTERVALS 2
    SIZE 100 10 
    STYLE 0
    POSITION LL
  END
  LAYER
    NAME "County Boundaries"
    STATUS ON
    DATA "AUS_Counties"
    TYPE POLYGON
    UNITS FEET
    SIZEUNITS PIXELS
    LABELITEM "CNTY_NM"
    LABELMINSCALE 100000
    CLASS
      LABEL
        TYPE TRUETYPE
        FONT "arial"
        SIZE 8
        POSITION CC
        COLOR 255 0 255
      END
      STYLE
        OUTLINECOLOR 192 0 255
        SIZE 2
      END
    END
  END
  LAYER
    NAME "Major Routes"
    STATUS ON
    DATA "AUS_Routes_Centerline"
    TYPE LINE
    CLASSITEM "RTE_PRFX_C"
    UNITS FEET
    SIZEUNITS PIXELS
    CLASS
      NAME "Interstate"
      EXPRESSION "IH"
      STYLE
        SYMBOL "BigLine"
        COLOR 255 0 0
        SIZE 1
      END
    END
    CLASS
      NAME "Highway"
      EXPRESSION "US"
      STYLE
        COLOR 0 0 0
        SIZE 1
      END
    END
    CLASS
      NAME "Other"
      EXPRESSION ('[RTE_PRFX_C] ' ne 'US' and '[RTE_PRFX_C] ' ne 'IH')
      STYLE
        COLOR 192 192 192
        SIZE 1
      END
    END
  END
  LAYER
    NAME "Billboards"
    STATUS ON
    DATA "billboards"
    TYPE POINT
    UNITS FEET
    SIZEUNITS PIXELS
    MINSCALE 1
    MAXSCALE 250000
    LABELITEM "PERMIT_NO"
    LABELMINSCALE 1
    LABELMAXSCALE 48000
    DEBUG On
    CLASS
      LABEL
        TYPE TRUETYPE
        FONT "arial"
        SIZE 6
        POSITION UR
        COLOR 255 0 0
      END
      STYLE
        SYMBOL "Circle"
        COLOR 255 0 0
        SIZE 2
      END
    END
  END
  LAYER
    NAME "credits"
    STATUS DEFAULT
    TYPE ANNOTATION
    TRANSFORM FALSE
    CLASS
      LABEL
        TYPE TRUETYPE
        FONT "arial-italic"
        SIZE 8
        POSITION UR
        COLOR 0 0 255
      END
    END
    FEATURE
      TEXT "© 2006 AZB"
      POINTS
         535 393
      END
    END
  END
  LAYER
    NAME "Route Labels"
    STATUS DEFAULT
    DATA "rte_lbl"
    TYPE ANNOTATION
    CLASSITEM "SYS"
    UNITS FEET
    SIZEUNITS PIXELS
    LABELITEM "NUM"
    DEBUG on
    CLASS
      NAME "Interstate Shields"
      EXPRESSION "IH"
      MINSCALE 1
      MAXSCALE 12000000
      COLOR 0 0 0
      LABEL
        TYPE TRUETYPE
        FONT "arial"
        SIZE 8
        POSITION CC
        MINFEATURESIZE 40
        MINDISTANCE 60
        COLOR 255 0 0
      END
      STYLE
        SYMBOL 2
        COLOR 0 0 0
      END
    END
    CLASS
      NAME "US Highways"
      EXPRESSION "US"
      MINSCALE 1
      MAXSCALE 12000000
      COLOR 0 0 0
      LABEL
        TYPE TRUETYPE
        FONT "arial"
        SIZE 6
        POSITION CC
        MINFEATURESIZE 40
        MINDISTANCE 40
        COLOR 0 0 0
      END
      STYLE
        SYMBOL 4
        COLOR 255 255 255
        OUTLINECOLOR 0 0 0
      END
    END
  END
END

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