diff --git a/README.md b/README.md
index dc963ad..8cc2cb3 100644
--- a/README.md
+++ b/README.md
@@ -180,15 +180,22 @@ plugin for Intel graphics is *NOT* installed (**uninstall it** if it is installe
 "-vs ximagesink" or "-vs xvimagesink", to see if this fixes the problem, or "-vs vaapisink" to see if this
 reproduces the problem.)
 
+If you ran cmake with "-DZOOMFIX=ON", check if the problem is still there without ZOOMFIX.
+ZOOMFIX does not fix the Zoom recognition issue for the OpenGL plugin glimagesink when it is running under X11,
+and is specifically not used if uxplay  is  invoked using "-vs glimagesink".    Please report, as an "issue" at
+[https://github.com/FDH2/UxPlay](https://github.com/FDH2/UxPlay) , 
+any plugins that are broken
+by ZOOMFIX, but work without it, so they can be added to the list of videosinks that don't use ZOOMFIX when it is available.    
+
+
 If your mirror window has no title showing, the "ZOOMFIX" will not work.
 The window is created by GStreamer, using a  videosink that the default "autovideosink" 
 has chosen for you. Maybe an unusual videosink was chosen.   Fix: use the -vs option to make your own choice of videosink:
 "-vs xvimagesink" or "-vs ximagesink" will create windows with titles on displays managed by X11.   Note that ZOOMFIX is a fix for a 
-problem specific to X11 windows (or possibly other window types (Wayland ?) in an X11-compatibility mode).   Non-X11 windows (such
-as OpenGL windows created by the videosink glimagesink) may be visible on Zoom without any fix (note that glimagesink has some
-problems, and may or may not work on your system).
-   
+problem specific to X11 windows (or possibly other window types (Wayland ?) in an X11-compatibility mode).
 
+The "OpenGL renderer" window created by glimagesink sometimes does not close properly when its "close" button is clicked.
+(this is a GStreamer issue).  You may need to terminate uxplay with Ctrl-C to close a "zombie" OpenGl window.
 
 #  **Usage:**
 
diff --git a/renderers/video_renderer_gstreamer.c b/renderers/video_renderer_gstreamer.c
index 02bfae8..e2b16ad 100644
--- a/renderers/video_renderer_gstreamer.c
+++ b/renderers/video_renderer_gstreamer.c
@@ -152,9 +152,18 @@ video_renderer_t *video_renderer_init(logger_t *logger, const char *server_name,
 
 #ifdef X_DISPLAY_FIX
     renderer->server_name = server_name;
-    renderer->gst_window = calloc(1, sizeof(X11_Window_t));
-    assert(renderer->gst_window);
-    get_X11_Display(renderer->gst_window);
+    bool x_display_fix = true;
+    if (videosink) {
+        /* X_DISPLAY_FIX doesn't work with glimagesink*/
+        /* list excluded videosinks: */
+        if (strcmp(videosink,"0") == 0) x_display_fix = false;
+        if (strcmp(videosink,"glimagesink") == 0) x_display_fix = false; 
+    }
+    if (x_display_fix) {
+        renderer->gst_window = calloc(1, sizeof(X11_Window_t));
+        assert(renderer->gst_window);
+        get_X11_Display(renderer->gst_window);
+    }
 #endif
     return renderer;
 }
@@ -177,7 +186,7 @@ void video_renderer_render_buffer(video_renderer_t *renderer, raop_ntp_t *ntp, u
     gst_app_src_push_buffer (GST_APP_SRC(renderer->appsrc), buffer);
 
 #ifdef X_DISPLAY_FIX
-    if(!(renderer->gst_window->window)) {
+    if(renderer->gst_window && !(renderer->gst_window->window)) {
         fix_x_window_name(renderer->gst_window, renderer->server_name);
     }
 #endif
@@ -192,7 +201,7 @@ void video_renderer_destroy(video_renderer_t *renderer) {
     gst_element_set_state (renderer->pipeline, GST_STATE_NULL);
     if(renderer->pipeline) gst_object_unref (renderer->pipeline);
 #ifdef X_DISPLAY_FIX
-    free(renderer->gst_window);
+    if(renderer->gst_window) free(renderer->gst_window);
 #endif    
     if (renderer) {
         free(renderer);