diff --git a/BPTCEncoder/src/BC7Compressor.cpp b/BPTCEncoder/src/BC7Compressor.cpp
index 0d5d632..6289471 100755
--- a/BPTCEncoder/src/BC7Compressor.cpp
+++ b/BPTCEncoder/src/BC7Compressor.cpp
@@ -37,7 +37,7 @@
 #define ALIGN_SSE __attribute__((aligned(16)))
 #endif
 
-#define USE_PCA_FOR_SHAPE_ESTIMATION
+// #define USE_PCA_FOR_SHAPE_ESTIMATION
 
 enum EBlockStats {
   eBlockStat_Path,
@@ -1710,7 +1710,7 @@ namespace BC7C
       error += 1.0;
     }
 #else
-    error += c.QuantizedError(Min, Max, 4, 0xFFFFFFFF, RGBAVector(w[0], w[1], w[2], w[3]));
+    error += c.QuantizedError(Min, Max, 8, 0xFFFFFFFF, RGBAVector(w[0], w[1], w[2], w[3]));
 #endif
     return error;
   }
@@ -1730,7 +1730,6 @@ namespace BC7C
     double eigOne = c.GetPrincipalEigenvalue();
     double eigTwo = c.GetSecondEigenvalue();
 
-    //    printf("EigOne: %08.3f\tEigTwo: %08.3f\n", eigOne, eigTwo);
     if(eigOne != 0.0) {
       error += eigTwo / eigOne;
     }
@@ -1738,7 +1737,7 @@ namespace BC7C
       error += 1.0;
     }
 #else
-    error += c.QuantizedError(Min, Max, 4, 0xFFFFFFFF, RGBAVector(w[0], w[1], w[2], w[3]));
+    error += c.QuantizedError(Min, Max, 2, 0xFFFFFFFF, RGBAVector(w[0], w[1], w[2], w[3]));
 #endif
     return error;
   }
diff --git a/CLTool/src/clunix.cpp b/CLTool/src/clunix.cpp
index 64ebe60..bbc1c53 100644
--- a/CLTool/src/clunix.cpp
+++ b/CLTool/src/clunix.cpp
@@ -8,7 +8,7 @@
 #include "Image.h"
 
 void PrintUsage() {
-   fprintf(stderr, "Usage: tc [-s|-t <num>] <imagefile>\n");
+   fprintf(stderr, "Usage: tc [-l] [-q <quality>] [-n <num>] [-simd] [-t <threads> [-j <jobs>]] <imagefile>\n");
 }
 
 int main(int argc, char **argv) {
@@ -24,6 +24,7 @@ int main(int argc, char **argv) {
   int numThreads = 1;
   int numCompressions = 1;
   bool bUseSIMD = false;
+  bool bSaveLog = false;
   
   bool knowArg = false;
   do {
@@ -41,8 +42,15 @@ int main(int argc, char **argv) {
       knowArg = true;
       continue;
     }
+
+    if(strcmp(argv[fileArg], "-l") == 0) {
+      fileArg++;
+      bSaveLog = true;
+      knowArg = true;
+      continue;
+    }
     
-    if(strcmp(argv[fileArg], "-s") == 0) {
+    if(strcmp(argv[fileArg], "-simd") == 0) {
       fileArg++;
       bUseSIMD = true;
       knowArg = true;
@@ -90,6 +98,12 @@ int main(int argc, char **argv) {
 
   } while(knowArg && fileArg < argc);
 
+  if(numThreads > 1 && bSaveLog) {
+    bSaveLog = false;
+    fprintf(stderr, "WARNING: Will not save log because implementation is not thread safe.\n"
+	    "If you'd like, send a complaint to pavel@cs.unc.edu to get this done faster.\n");
+  }
+
   if(fileArg == argc) {
     PrintUsage();
     exit(1);
@@ -105,7 +119,10 @@ int main(int argc, char **argv) {
   const Image *img = file.GetImage();
 
   int numBlocks = (img->GetWidth() * img->GetHeight())/16;
-  BlockStatManager *statManager = new BlockStatManager(numBlocks);
+  BlockStatManager *statManager = NULL;
+  if(bSaveLog) {
+    statManager = new BlockStatManager(numBlocks);
+  }
   
   SCompressionSettings settings;
   settings.bUseSIMD = bUseSIMD;
@@ -129,11 +146,14 @@ int main(int argc, char **argv) {
     fprintf(stderr, "Error computing PSNR\n");
   }
 
-  statManager->ToFile(strcat(argv[fileArg], "-log.txt"));
+  if(bSaveLog) {
+    statManager->ToFile(strcat(argv[fileArg], ".log"));
+  }
 
   // Cleanup 
   delete ci;
-  delete statManager;
+  if(statManager)
+    delete statManager;
 
   return 0;
 }