diff --git a/slsDetectorSoftware/slsDetector/slsDetector.cpp b/slsDetectorSoftware/slsDetector/slsDetector.cpp
index 980c317f4..1e5a87d9d 100644
--- a/slsDetectorSoftware/slsDetector/slsDetector.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetector.cpp
@@ -7525,9 +7525,12 @@ int slsDetector::startReceiver(){
 				setErrorMask((getErrorMask())|(COULDNOT_START_RECEIVER));
 		}
 	}
-	//let detector prepare anyway even if receiver didnt work
-	if((thisDetector->myDetectorType != JUNGFRAU))
-		ret=detectorSendToReceiver(true);
+	//let detector prepare anyway even if receiver didnt work (for those not using the receiver)
+	if((thisDetector->myDetectorType != JUNGFRAU)) {
+		int ret1 = detectorSendToReceiver(true);
+		if (ret != FAIL)
+			ret = ret1;
+	}
 
 	return ret;
 }
diff --git a/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp b/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
index 0e6d5e763..ec3d1dae5 100644
--- a/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
@@ -226,9 +226,6 @@ int  slsDetectorUtils::acquire(int delflag){
      
 	for (int ip=0; ip<np; ip++) {
 
-		//let processing thread listen to these packets
-		sem_post(&sem_newRTAcquisition);
-
 	  //   cout << "positions " << endl;
 	  if (*stoppedFlag==0) {
 	    if  (getNumberOfPositions()>0) {
@@ -297,12 +294,17 @@ int  slsDetectorUtils::acquire(int delflag){
 	    	setFileName(fileIO::getFileName());
 	    	//start receiver
 	    	if(startReceiver() == FAIL) {
+	    		cout << "Start receiver failed " << endl;
 	    		stopReceiver();
 	    		*stoppedFlag=1;
 	    		pthread_mutex_unlock(&mg);
 	    		break;
 	    	}
 	    	pthread_mutex_unlock(&mg);
+
+			//let processing thread listen to these packets
+			sem_post(&sem_newRTAcquisition);
+
 	    }
 #ifdef VERBOSE
 	    cout << "Acquiring " << endl;