diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index a3babe2ad..d236682c3 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer
index 6de67d735..81848e47e 100755
Binary files a/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer and b/slsDetectorServers/eigerDetectorServer/bin/eigerDetectorServer_developer differ
diff --git a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer
index f7574accb..2d70b2e23 100755
Binary files a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer and b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer differ
diff --git a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer
index 82417accf..03f2e951f 100755
Binary files a/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer and b/slsDetectorServers/gotthardDetectorServer/bin/gotthardDetectorServer_developer differ
diff --git a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer
index 35c788fe2..2aa794e2d 100755
Binary files a/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer and b/slsDetectorServers/jungfrauDetectorServer/bin/jungfrauDetectorServer_developer differ
diff --git a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer
index 5f5a1828c..2a4ab7134 100755
Binary files a/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer and b/slsDetectorServers/moenchDetectorServer/bin/moenchDetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index b2ab33c88..0da2dd9e3 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
index aa4bb48a5..2aaa243c3 100644
--- a/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
+++ b/slsDetectorServers/slsDetectorServer/src/slsDetectorServer_funcs.c
@@ -4772,7 +4772,8 @@ int set_read_n_rows(int file_des) {
     functionNotImplemented();
 #else
     // only set
-    if (Server_VerifyLock() == OK) {
+    if ((Server_VerifyLock() == OK) &&
+        (check_detector_idle("set number of rows") == OK)) {
         if (arg < MIN_ROWS_PER_READOUT || arg > MAX_ROWS_PER_READOUT) {
             ret = FAIL;
             sprintf(mess,
@@ -4804,8 +4805,7 @@ int set_read_n_rows(int file_des) {
                 LOG(logERROR, (mess));
             } else
 #elif defined(JUNGFRAUD) || defined(MOENCHD)
-            if ((check_detector_idle("set number of rows") == OK) &&
-                (arg % READ_N_ROWS_MULTIPLE != 0)) {
+            if (arg % READ_N_ROWS_MULTIPLE != 0) {
                 ret = FAIL;
                 sprintf(mess,
                         "Could not set number of rows. %d must be a multiple "
@@ -8472,9 +8472,9 @@ int set_master(int file_des) {
     functionNotImplemented();
 #else
     // only set
-    if (Server_VerifyLock() == OK) {
-        if ((check_detector_idle("set master") == OK) &&
-            (arg != 0 && arg != 1)) {
+    if ((Server_VerifyLock() == OK) &&
+        (check_detector_idle("set master") == OK)) {
+        if (arg != 0 && arg != 1) {
             ret = FAIL;
             sprintf(mess, "Could not set master. Invalid argument %d.\n", arg);
             LOG(logERROR, (mess));
@@ -9028,9 +9028,9 @@ int set_flip_rows(int file_des) {
     functionNotImplemented();
 #else
     // only set
-    if (Server_VerifyLock() == OK) {
-        if ((check_detector_idle("set flip rows") == OK) &&
-            (arg != 0 && arg != 1)) {
+    if ((Server_VerifyLock() == OK) &&
+        (check_detector_idle("set flip rows") == OK)) {
+        if (arg != 0 && arg != 1) {
             ret = FAIL;
             sprintf(mess, "Could not set flip rows. Invalid argument %d.\n",
                     arg);
@@ -10365,9 +10365,9 @@ int set_synchronization(int file_des) {
     functionNotImplemented();
 #else
     // only set
-    if (Server_VerifyLock() == OK) {
-        if ((check_detector_idle("set synchronization") == OK) &&
-            (arg != 0 && arg != 1)) {
+    if ((Server_VerifyLock() == OK) &&
+        (check_detector_idle("set synchronization") == OK)) {
+        if (arg != 0 && arg != 1) {
             ret = FAIL;
             sprintf(mess,
                     "Could not set synchronization. Invalid argument %d.\n",
diff --git a/slsDetectorSoftware/tests/test-CmdProxy-jungfrau.cpp b/slsDetectorSoftware/tests/test-CmdProxy-jungfrau.cpp
index ce1b75cdb..27b652f4d 100644
--- a/slsDetectorSoftware/tests/test-CmdProxy-jungfrau.cpp
+++ b/slsDetectorSoftware/tests/test-CmdProxy-jungfrau.cpp
@@ -705,6 +705,34 @@ TEST_CASE("sync", "[.cmd]") {
             proxy.Call("sync", {}, -1, GET, oss);
             REQUIRE(oss.str() == "sync 1\n");
         }
+        // setting sync when running
+        {
+            auto prev_timing =
+                det.getTimingMode().tsquash("inconsistent timing mode in test");
+            auto prev_frames =
+                det.getNumberOfFrames().tsquash("inconsistent #frames in test");
+            auto prev_exptime =
+                det.getExptime().tsquash("inconsistent exptime in test");
+            auto prev_period =
+                det.getPeriod().tsquash("inconsistent period in test");
+            det.setTimingMode(defs::AUTO_TIMING);
+            det.setNumberOfFrames(10000);
+            det.setExptime(std::chrono::microseconds(200));
+            det.setPeriod(std::chrono::milliseconds(1000));
+            det.setSynchronization(1);
+            det.startDetector();
+            REQUIRE_THROWS(proxy.Call("sync", {"0"}, -1, PUT));
+            {
+                std::ostringstream oss;
+                proxy.Call("sync", {}, -1, GET, oss);
+                REQUIRE(oss.str() == "sync 1\n");
+            }
+            det.stopDetector();
+            det.setTimingMode(prev_timing);
+            det.setNumberOfFrames(prev_frames);
+            det.setExptime(prev_exptime);
+            det.setPeriod(prev_period);
+        }
         det.setSynchronization(prev_val);
     } else {
         REQUIRE_THROWS(proxy.Call("sync", {}, -1, GET));
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index a1d345a42..04424011c 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -4,10 +4,10 @@
 #define RELEASE      "developer"
 #define APILIB       "developer 0x230224"
 #define APIRECEIVER  "developer 0x230224"
-#define APICTB "developer 0x231108"
-#define APIGOTTHARD "developer 0x231108"
-#define APIGOTTHARD2 "developer 0x231108"
-#define APIJUNGFRAU "developer 0x231108"
-#define APIMYTHEN3 "developer 0x231108"
-#define APIMOENCH "developer 0x231108"
-#define APIEIGER "developer 0x231108"
+#define APICTB       "developer 0x231109"
+#define APIGOTTHARD  "developer 0x231109"
+#define APIGOTTHARD2 "developer 0x231109"
+#define APIJUNGFRAU  "developer 0x231109"
+#define APIMYTHEN3   "developer 0x231109"
+#define APIMOENCH    "developer 0x231109"
+#define APIEIGER     "developer 0x231109"