Here's what lasinfo's output looks like when I use the latest default branch from Mercurial. It looks ok to me. I think the Merrick files were one the variants that writes a lot of stuff in the buffer between the end of the header and before the beginning of the points.

http://liblas.org/ticket/142

Any chance you can build from source?

---------------------------------------------------------
  Header Summary
---------------------------------------------------------
  File Name: M_S_FL_Water_District.las
  Version:                    1.0
  Source ID:                  0
  Reserved:                   0
  Project ID/GUID:           '00000008-001e-07d1-0000-000000000000'
  System Identifier:         ''
  Generating Software:       'Merrick LiDAR Processing System'
  File Creation Day/Year:    264/2006
  Header Size                227
  Offset to Point Data       451
  Number Var. Length Records 1
  Point Data Format          1
  Point Data Record Length   28
  Number of Point Records    4045371
  Number of Points by Return 3641232 389423 14560 156 0
  Scale Factor X Y Z         0.01 0.01 0.01
  Offset X Y Z               0.000000 0.000000 0.000000
  Min X Y Z                  620000.010000 1055000.000000 31.420000
  Max X Y Z                  625000.000000 1060000.000000 560.500000
 Spatial Reference
Geotiff_Information:
   Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      End_Of_Tags.
   Keyed_Information:
      End_Of_Keys.
   End_Of_Geotiff.

---------------------------------------------------------
  VLR Summary
---------------------------------------------------------
   User: 'LASF_Projection' - Description: 'Projection Info'
   ID: 34736 Length: 40


---------------------------------------------------------
  Point Inspection Summary
---------------------------------------------------------
  Header Point Count: 4045371
  Actual Point Count: 4045371

  Minimum and Maximum Attributes (min,max)
---------------------------------------------------------
  Min X,Y,Z:            620000.010000,1055000.000000,31.420000
  Max X,Y,Z:            625000.000000,1060000.000000,560.500000
  Bounding Box:         620000.01,1055000.00,625000.00,1060000.00
  Time:                 566520.403957,570126.967477
  Return Number:        1,4
  Return Count:         1,4
  Flightline Edge:      0,0
  Intensity:            0,244
  Scan Direction Flag:  0,1
  Scan Angle Rank:      -15,16
  Classification:       1,10
  Point Source Id:      235,237
  Minimum Color:         0 0 0
  Maximum Color:         0 0 0

  Number of Points by Return
---------------------------------------------------------
        (0) 3641232     (1) 389423      (2) 14560       (3) 156 (4) 0
 Total Points: 4045371

  Number of Returns by Pulse
---------------------------------------------------------
        (1) 3247914     (2) 750421      (3) 46171       (4) 865 (5) 0   (6) 0   
(7) 0
 Total Pulses: 4045371

  Point Classifications
---------------------------------------------------------
         3897935 Unclassified (1)
          138167 Ground (2)
             133 Water (9)
            9136 Reserved for ASPRS Definition (10)


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