Index: trunk/psModules/src/detrend/psIOBuffer.c
===================================================================
--- trunk/psModules/src/detrend/psIOBuffer.c	(revision 7770)
+++ trunk/psModules/src/detrend/psIOBuffer.c	(revision 7772)
@@ -21,7 +21,7 @@
     buffer->data = (char *) psAlloc (nBuffer);
 
-    buffer->nAlloc = 0;
-    buffer->nReset = 0;
-    buffer->nBlock = 0;
+    buffer->nAlloc = nBuffer;
+    buffer->nReset = nBuffer;
+    buffer->nBlock = nBuffer / 2;
     buffer->n = 0;
     return (buffer);