diff --git a/DesertPaintLab.csproj b/DesertPaintLab.csproj
--- a/DesertPaintLab.csproj
+++ b/DesertPaintLab.csproj
@@ -24,7 +24,7 @@
     <ApplicationVersion>1.0.0.%2a</ApplicationVersion>
     <UseApplicationTrust>false</UseApplicationTrust>
     <BootstrapperEnabled>true</BootstrapperEnabled>
-    <ReleaseVersion>9.0.3</ReleaseVersion>
+    <ReleaseVersion>9.0.4</ReleaseVersion>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <DebugSymbols>true</DebugSymbols>
diff --git a/DesertPaintLab.sln b/DesertPaintLab.sln
--- a/DesertPaintLab.sln
+++ b/DesertPaintLab.sln
@@ -41,6 +41,6 @@ Global
 		$0.StandardHeader = $5
 		$0.VersionControlPolicy = $6
 		description = Desert Paint Lab utility for A Tale in the Desert
-		version = 9.0.3
+		version = 9.0.4
 	EndGlobalSection
 EndGlobal
diff --git a/ReactionRecorder.cs b/ReactionRecorder.cs
--- a/ReactionRecorder.cs
+++ b/ReactionRecorder.cs
@@ -336,7 +336,7 @@ namespace DesertPaintLab
             {
                 int testPixel = solidUpperLeft + (yOff * stride);
                 result &= IsColorMatch(swatch_r, swatch_r, swatch_r, pixBytes[testPixel], pixBytes[testPixel + 1], pixBytes[testPixel + 2]);
-                testPixel += ((swatchWidth - 1) * (x + 3));
+                testPixel += ((swatchWidth - 1) * 3);
                 result &= IsColorMatch(swatch_r, swatch_r, swatch_r, pixBytes[testPixel], pixBytes[testPixel + 1], pixBytes[testPixel + 2]);
             }