diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index 78a17b33..cc837fb7 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -1908,7 +1908,7 @@ void WS2812FX::service() {
     if(nowUp >= seg.next_time || _triggered || (doShow && seg.mode == FX_MODE_STATIC))  // WLEDMM ">=" instead of ">"
     {
       if (seg.grouping == 0) seg.grouping = 1; //sanity check
-      doShow = true;
+      if (!seg.freeze) doShow = true;
       uint16_t frameDelay = FRAMETIME;    // WLEDMM avoid name clash with "delay" function
 
       if (!seg.freeze) { //only run effect function if not frozen
diff --git a/wled00/bus_manager.cpp b/wled00/bus_manager.cpp
index 19c0c174..880ba24f 100644
--- a/wled00/bus_manager.cpp
+++ b/wled00/bus_manager.cpp
@@ -1308,6 +1308,7 @@ void IRAM_ATTR __attribute__((hot)) BusManager::setPixelColor(uint16_t pix, uint
 
   for (uint_fast8_t i = 0; i < numBusses; i++) {    // WLEDMM use fast native types
     Bus* b = busses[i];
+    if (b->isValid() == false) continue;  // WLEDMM ignore invalid (=not ready) busses
     uint_fast16_t bstart = b->getStart();
     if (pix < bstart || pix >= bstart + b->getLength()) continue;
     else {
@@ -1346,6 +1347,7 @@ uint32_t IRAM_ATTR  __attribute__((hot)) BusManager::getPixelColor(uint_fast16_t
 
   for (uint_fast8_t i = 0; i < numBusses; i++) {
     Bus* b = busses[i];
+    if (b->isValid() == false) continue;  // WLEDMM ignore invalid (=not ready) busses
     uint_fast16_t bstart = b->getStart();
     if (pix < bstart || pix >= bstart + b->getLength()) continue;
     else {
@@ -1369,6 +1371,7 @@ uint32_t IRAM_ATTR  __attribute__((hot)) BusManager::getPixelColorRestored(uint_
 
   for (uint_fast8_t i = 0; i < numBusses; i++) {
     Bus* b = busses[i];
+    if (b->isValid() == false) continue;  // WLEDMM ignore invalid (=not ready) busses
     uint_fast16_t bstart = b->getStart();
     if (pix < bstart || pix >= bstart + b->getLength()) continue;
     else {
diff --git a/wled00/bus_manager.h b/wled00/bus_manager.h
index 04062215..c212eca2 100644
--- a/wled00/bus_manager.h
+++ b/wled00/bus_manager.h
@@ -190,6 +190,7 @@ class Bus {
     inline        uint8_t getAutoWhiteMode()          const { return _autoWhiteMode; }
     inline static void    setGlobalAWMode(uint8_t m)  { if (m < 5) _gAWM = m; else _gAWM = AW_GLOBAL_DISABLED; }
     inline static uint8_t getGlobalAWMode()           { return _gAWM; }
+    inline        bool    isValid()                   const {return _valid;}
 
     inline static uint32_t restore_Color_Lossy(uint32_t c, uint8_t restoreBri) { // shamelessly grabbed from upstream, who grabbed from NPB, who ..
       if (restoreBri < 255) {
diff --git a/wled00/udp.cpp b/wled00/udp.cpp
index bec3c0e2..815842f0 100644
--- a/wled00/udp.cpp
+++ b/wled00/udp.cpp
@@ -155,8 +155,13 @@ void realtimeLock(uint32_t timeoutMs, byte md)
   if (!realtimeMode && !realtimeOverride) {
     // this code runs once when we enter realtime mode
     // WLEDMM begin - we need to init segment caches before putting any pixels
+    USER_PRINT(F("realtimeLock() entering realtime mode [timeoutMs="));
+    USER_PRINT(timeoutMs); USER_PRINT(",mode="); USER_PRINT(md);
+    if (useMainSegmentOnly) USER_PRINTLN(F(", main segment only].")) else USER_PRINTLN(F("]."));
+    USER_FLUSH();
+
     if (strip.isServicing()) {
-      USER_PRINTLN(F("realtimeLock() enter RTM: strip is still drawing effects."));
+      USER_PRINTLN(F("realtimeLock() entering RTM: strip is still drawing effects."));
       strip.waitUntilIdle();
     }
     strip.service(); // WLEDMM make sure that all segments are properly initialized
@@ -211,6 +216,7 @@ void exitRealtime() {
     strip.show(); // possible fix for #3589
   }
   busses.invalidateCache(false);  // WLEDMM
+  USER_PRINTLN(F("exitRealtime() realtime mode ended."));
   updateInterfaces(CALL_MODE_WS_SEND);
 }