diff --git a/blake32.cu b/blake32.cu
index 96a78a0..6b51e2e 100644
--- a/blake32.cu
+++ b/blake32.cu
@@ -361,7 +361,7 @@ extern "C" int scanhash_blake256(int thr_id, uint32_t *pdata, const uint32_t *pt
 					be32enc(&endiandata[19], extra_results[0]);
 					blake256hash(vhashcpu, endiandata, blakerounds);
 					if (vhashcpu[7] <= Htarg && fulltest(vhashcpu, ptarget)) {
-						applog(LOG_NOTICE, "GPU found more than one result yippee!");
+						applog(LOG_NOTICE, "GPU found more than one result " CL_GRN "yippee!");
 						rc = 2;
 					} else {
 						extra_results[0] = MAXU;
diff --git a/cpu-miner.c b/cpu-miner.c
index 2b04c5c..77a7526 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -181,7 +181,7 @@ bool want_stratum = true;
 bool have_stratum = false;
 static bool submit_old = false;
 bool use_syslog = false;
-bool use_colors = false;
+bool use_colors = true;
 static bool opt_background = false;
 bool opt_quiet = false;
 static int opt_retries = -1;
@@ -940,12 +940,11 @@ static void *miner_thread(void *userdata)
 		}
 		if (memcmp(work.data, g_work.data, wcmplen)) {
 			if (opt_debug) {
-				applog(LOG_DEBUG, "job %s work updated", g_work.job_id);
-				for (int n=0; n<wcmplen; n+=8) {
+				for (int n=0; n <= (wcmplen-8); n+=8) {
 					if (memcmp(work.data + n, g_work.data + n, 8)) {
-						applog(LOG_DEBUG, "diff detected at offset %d", n);
+						applog(LOG_DEBUG, "job %s work updated at offset %d:", g_work.job_id, n);
 						applog_hash((uint8_t*) work.data + n);
-						applog_hash((uint8_t*) g_work.data + n);
+						applog_compare_hash((uint8_t*) g_work.data + n, (uint8_t*) work.data + n);
 					}
 				}
 			}
@@ -953,9 +952,9 @@ static void *miner_thread(void *userdata)
 			(*nonceptr) = (0xffffffffUL / opt_n_threads) * thr_id; // 0 if single thr
 		} else if (memcmp(work.target, g_work.target, sizeof(work.target))) {
 			if (opt_debug) {
-				applog(LOG_DEBUG, "job %s target change", g_work.job_id);
+				applog(LOG_DEBUG, "job %s target change:", g_work.job_id);
 				applog_hash((uint8_t*) work.target);
-				applog_hash((uint8_t*) g_work.target);
+				applog_compare_hash((uint8_t*) g_work.target, (uint8_t*) work.target);
 			}
 			memcpy(work.target, g_work.target, sizeof(work.target));
 			(*nonceptr) = (0xffffffffUL / opt_n_threads) * thr_id; // 0 if single thr
@@ -1021,7 +1020,7 @@ static void *miner_thread(void *userdata)
 				stall |= (start_nonce > range.scanned[0] && start_nonce < range.scanned[1]);
 
 				if (stall) {
-					if (opt_algo)
+					if (opt_debug && !opt_quiet)
 						applog(LOG_DEBUG, "job done, wait for a new one...");
 					work_restart[thr_id].restart = 1;
 					hashlog_purge_old();
@@ -1464,13 +1463,14 @@ static void parse_arg (int key, char *arg)
 	case 'C':
 		use_colors = true;
 		break;
-	case 'q':
-		opt_quiet = true;
-		break;
 	case 'D':
 		opt_debug = true;
 		opt_debug_rpc = true;
 		break;
+	case 'q':
+		opt_quiet = true;
+		opt_debug_rpc = false;
+		break;
 	case 'p':
 		free(rpc_pass);
 		rpc_pass = strdup(arg);
diff --git a/miner.h b/miner.h
index e33bfff..6bd0ae5 100644
--- a/miner.h
+++ b/miner.h
@@ -422,6 +422,7 @@ size_t time2str(char* buf, time_t timer);
 char* atime2str(time_t timer);
 
 void applog_hash(unsigned char *hash);
+void applog_compare_hash(unsigned char *hash, unsigned char *hash2);
 
 void print_hash_tests(void);
 void animehash(void *state, const void *input);
diff --git a/util.c b/util.c
index 6ed44c0..eb4af11 100644
--- a/util.c
+++ b/util.c
@@ -1401,6 +1401,20 @@ static char* format_hash(char* buf, unsigned char *hash)
 	return buf;
 }
 
+/* to debug diff in data */
+extern void applog_compare_hash(unsigned char *hash, unsigned char *hash2)
+{
+	char s[256] = "";
+	int len = 0;
+	for (int i=0; i < 32; i += 4) {
+		char *color = memcmp(hash+i, hash2+i, 4) ? CL_RED : CL_GRY;
+		len += sprintf(s+len, "%s%02x%02x%02x%02x " CL_GRY, color,
+			hash[i], hash[i+1], hash[i+2], hash[i+3]);
+		s[len] = '\0';
+	}
+	applog(LOG_DEBUG, "%s", s);
+}
+
 extern void applog_hash(unsigned char *hash)
 {
 	char s[128] = {'\0'};