Merge Cyd's vPLASMA_fix: the desktop plasma marquee showed heap garbage from boot until the first callsign draw -- PixelMap8 allocates uncleared and the glass window blits the WHOLE buffer (the pod's serial path only sent changed lines, so hardware never showed it). Ctor memset to index 0; glass-only.

engine/MUNGA_L4/L4PLASMAWIN.cpp

@@ -54,6 +54,22 @@ PlasmaWindow::PlasmaWindow():
 	}
 	blitBuffer = new unsigned long[plasmaWidth * plasmaHeight];
 	memset(blitBuffer, 0, plasmaWidth * plasmaHeight * sizeof(unsigned long));
+
+	//
+	// INITIALIZE THE DISPLAY AREA (2026-08-10).  PixelMap8(w,h) allocates its
+	// pixel bytes UNCLEARED (GRAPH2D.cpp: `new Byte[w*h]`, no memset), so the
+	// 128x32 plasma buffer starts as heap garbage.  The real pod never showed
+	// it: the serial PlasmaDisplay transfers only CHANGED lines (changedLine[]
+	// is zeroed by the base ctor), so the garbage never left the buffer and
+	// the hardware marquee sat at its power-on blank.  This desktop window
+	// blits the WHOLE buffer every frame, so the junk was visible from boot
+	// until the gauge renderer first drew the callsigns.  Clear to index 0
+	// (the near-black background) -- the window comes up blank like the
+	// hardware did.
+	//
+	if (pixelBuffer != NULL && pixelBuffer->Data.MapPointer != NULL)
+		memset(pixelBuffer->Data.MapPointer, 0, plasmaWidth * plasmaHeight);
+
 	DEBUG_STREAM << "[plasmawin] desktop plasma display up (scale x"
 		<< scale << ")\n" << std::flush;
 }