diff --git a/Preprocessing/timeDriftPP.m b/Preprocessing/timeDriftPP.m
index 790865641..da4c26c4a 100644
--- a/Preprocessing/timeDriftPP.m
+++ b/Preprocessing/timeDriftPP.m
@@ -62,10 +62,10 @@
 
 if ~iscell(sample_data), error('sample_data must be a cell array'); end
 if isempty(sample_data), return;                                    end
-% if this is the second time through (ie for applying autoQC PP
-% routines), then return. sample_data already contains the corrections
-% and they are therefore carried through.
-if auto, return; end
+
+% no modification of data is performed on the raw FV00 dataset except
+% local time to UTC conversion
+if strcmpi(qcLevel, 'raw'), return; end
 
 % auto logical in input to enable running under batch processing
 if nargin<3, auto=false; end
@@ -189,7 +189,7 @@
     
     %check for zero values in both fields
     if startOffsets(k) == 0 && endOffsets(k) == 0
-        continue
+        continue;
     end
     
     % look time through dimensions
diff --git a/imosToolbox.m b/imosToolbox.m
index 728e71964..9404f8b3d 100644
--- a/imosToolbox.m
+++ b/imosToolbox.m
@@ -73,7 +73,7 @@ function imosToolbox(auto, varargin)
 end
 
 % Set current toolbox version
-toolboxVersion = ['2.5.5 - ' computer];
+toolboxVersion = ['2.5.6 - ' computer];
 
 switch auto  
   case 'auto', autoIMOSToolbox(toolboxVersion, varargin{:});
diff --git a/imosToolbox_Linux64.bin b/imosToolbox_Linux64.bin
index 991045dc3..bac0fc3d4 100755
Binary files a/imosToolbox_Linux64.bin and b/imosToolbox_Linux64.bin differ
diff --git a/imosToolbox_Win32.exe b/imosToolbox_Win32.exe
index 560ca33cc..8701f239c 100644
Binary files a/imosToolbox_Win32.exe and b/imosToolbox_Win32.exe differ
diff --git a/imosToolbox_Win64.exe b/imosToolbox_Win64.exe
index d2199ea30..fd75130a8 100644
Binary files a/imosToolbox_Win64.exe and b/imosToolbox_Win64.exe differ