--- a/lib/src/ItalcVncConnection.cpp	
+++ a/lib/src/ItalcVncConnection.cpp	
@@ -118,6 +118,8 @@ rfbBool ItalcVncConnection::hookNewClient( rfbClient *cl )
 
 	const int size = (int) cl->width * cl->height *
 					( cl->format.bitsPerPixel / 8 );
+	if(t->m_image.width() != cl->width && t->m_image.height() != cl->height)
+	{
 	if( t->m_frameBuffer )
 	{
 		// do not leak if we get a new framebuffer size
@@ -134,6 +136,7 @@ rfbBool ItalcVncConnection::hookNewClient( rfbClient *cl )
 	cl->format.redMax = 0xff;
 	cl->format.greenMax = 0xff;
 	cl->format.blueMax = 0xff;
+	}
 
 	// only use remote cursor for remote control
 	cl->appData.useRemoteCursor = false;