From Andreas Ekstrand, "he attached ESRIShape.cpp contains a small fix in parsing of PointZ features, now correctly comparing with header content length which is defined in 16-bit words.

This should have been fixed in my old submission from 2012 but was probably overlooked due to an alternative way of comparing to a fix number for this feature type.

Without this fix, the plugin will only read one PointZ feature even if multiple features exist."

src/osgPlugins/shp/ESRIShape.cpp

@@ -838,7 +838,7 @@ bool PointZ::read( int fd )
         return false;
 
     // Sometimes, M field is not supplied
-    if( rh.contentLength >= 18 )
+    if( rh.contentLength*2 >= 18 )
         if( readVal<Double>( fd, m, LittleEndian ) == false )
             return false;