Hi, today I have downloaded and compiled the opengl plugins from the git repository in a PC with Debian Lenny and it worked Ok. This evening I have tried to do the same process in another computer, also with Debian Lenny, but in this case for AMD64 architecture. In this case, when executing a test pipeline or the cube test application, I get a segmentation fault. I cannot assure 100% that both systems are equal (but for that little detail of the number of bits), but I have installed them both in the las two days, and more or less with the same packages. These are the test pipelines I hav tried: gst-launch-0.10  --gst-debug=glupload:5 --gst-debug=gldisplay:5  videotestsrc !  glupload ! fakesink gst-launch-0.10  --gst-debug=glupload:5 --gst-debug=gldisplay:5  videotestsrc !  glimagesink (At the end of the mail the log output). I have been looking into the code and the segmentation fault happens in gstdisplay.c, in method gst_gl_display_init_upload, which is called from gst_gl_upload_set_caps and in gst_glimage_sink_render. More exactely the  SIGSEGV happens when calling gst_gl_window_send_message. Has anyone managed to use the opengl plugins in an amd64 system? Thanks and great job these plugins (and gstreamer in general). Alex PS: The log (just the last lines) for the glupload case: 0:00:00.362859526 27390 0x2360920 INFO             gldisplay gstgldisplay.c:413:gst_gl_display_thread_create_context: gl window created 0:00:00.365397907 27390 0x2360920 INFO             gldisplay gstgldisplay.c:429:gst_gl_display_thread_create_context: GL_VERSION: 2.1.2 NVIDIA 173.14.09 0:00:00.365416485 27390 0x2360920 INFO             gldisplay gstgldisplay.c:430:gst_gl_display_thread_create_context: GLEW_VERSION: 1.5.0 0:00:00.365426612 27390 0x2360920 INFO             gldisplay gstgldisplay.c:432:gst_gl_display_thread_create_context: GL_SHADING_LANGUAGE_VERSION: 1.20 NVIDIA via Cg compiler 0:00:00.365438555 27390 0x2360920 INFO             gldisplay gstgldisplay.c:436:gst_gl_display_thread_create_context: GL_VENDOR: NVIDIA Corporation 0:00:00.365447005 27390 0x2360920 INFO             gldisplay gstgldisplay.c:437:gst_gl_display_thread_create_context: GL_RENDERER: GeForce 8600M GT/PCI/SSE2 0:00:00.365481298 27390 0x24e6a00 INFO             gldisplay gstgldisplay.c:1510:gst_gl_display_create_context: gl thread created 0:00:00.365522085 27390 0x24e6a00 INFO             gldisplay gstgldisplay.c:1514:gst_gl_display_create_context: gl thread created and unlocked 0:00:00.429685477 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:413:gst_gl_display_thread_create_context: gl window created 0:00:00.432397903 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:429:gst_gl_display_thread_create_context: GL_VERSION: 2.1.2 NVIDIA 173.14.09 0:00:00.432428214 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:430:gst_gl_display_thread_create_context: GLEW_VERSION: 1.5.0 0:00:00.432436874 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:432:gst_gl_display_thread_create_context: GL_SHADING_LANGUAGE_VERSION: 1.20 NVIDIA via Cg compiler 0:00:00.432445954 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:436:gst_gl_display_thread_create_context: GL_VENDOR: NVIDIA Corporation 0:00:00.432453846 27390 0x25a06f0 INFO             gldisplay gstgldisplay.c:437:gst_gl_display_thread_create_context: GL_RENDERER: GeForce 8600M GT/PCI/SSE2 0:00:00.432507763 27390 0x24e6a00 INFO             gldisplay gstgldisplay.c:1510:gst_gl_display_create_context: gl thread created Caught SIGSEGV accessing address 0xffffffff9d50dae0 -- Eng. Alex Ugarte Interactive television and multimedia services department VICOMTech - Visual Interaction and Communication Technologies Center Mikeletegi Pasealekua, 57 - Parque Tecnológico E-20009 Donostia - San Sebastián, Spain Tel:  +[34] 943 30 92 30 Fax: +[34] 943 30 93 93 e-mail: <a href="mailto:augarte@vicomtech.org">augarte@vicomtech.org</a> web: <a href="http://www.vicomtech.org">www.vicomtech.org</a> *** member of INI-GraphicsNet **** *** member of IK4 Research Alliance ****