May I know which version of Lightroom are you using? you can check that by going to Help > System info.
Here's my system info:
Lightroom version: CC 2015.7 [ 1090788 ]
License: Creative Cloud
Operating system: Mac OS 10
Version: 10.12 
Application architecture: x64
Logical processor count: 4
Processor speed: 3.2 GHz
Built-in memory: 24,576.0 MB
Real memory available to Lightroom: 24,576.0 MB
Real memory used by Lightroom: 250.2 MB (1.0%)
Virtual memory used by Lightroom: 888.4 MB
Memory cache size: 4.8 MB
Maximum thread count used by Camera Raw: 4
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Displays: 1) 2560x1440
Graphics Processor Info:
NVIDIA GeForce GT 755M OpenGL Engine
Check OpenGL support: Passed
Vendor: NVIDIA Corporation
Version: 4.1 NVIDIA-10.12.65 355.10.05.05b16
Renderer: NVIDIA GeForce GT 755M OpenGL Engine
Application folder: /Applications/Adobe Lightroom
Library Path: /Volumes/Macintosh HD/BG Lightroom September 2016/BG Lightroom September 2016.lrcat
Settings Folder: /Users/imacbg/Library/Application Support/Adobe/Lightroom
2) Aperture/iPhoto Importer Plug-in
3) Canon Tether Plugin
4) DxO FilmPack 3
5) DxO FilmPack 3 (64-bit)
8) HDR Efex Pro 2
9) Leica Tether Plugin
10) Nikon Tether Plugin
11) ON1 Effects 10
12) ON1 Enhance 10
13) ON1 Photo 10
14) ON1 Portrait 10
15) ON1 Resize 10
16) Open in RPP
17) Perfectly Clear Complete
Config.lua flags: None
AudioDeviceName: Built-in Output
GL_RENDERER: NVIDIA GeForce GT 755M OpenGL Engine
GL_VENDOR: NVIDIA Corporation
GL_VERSION: 2.1 NVIDIA-10.12.65 355.10.05.05b16
GL_EXTENSIONS: GL_ARB_color_buffer_float GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_draw_buffers GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_instanced_arrays GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_provoking_vertex GL_ARB_seamless_cube_map GL_ARB_shader_objects GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_sync GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_float GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_transpose_matrix GL_ARB_vertex_array_bgra GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_depth_bounds_test GL_EXT_draw_buffers2 GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_provoking_vertex GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture_array GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_s3tc GL_EXT_texture_env_add GL_EXT_texture_filter_anisotropic GL_EXT_texture_integer GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_rectangle GL_EXT_texture_shared_exponent GL_EXT_texture_sRGB GL_EXT_texture_sRGB_decode GL_EXT_timer_query GL_EXT_transform_feedback GL_EXT_vertex_array_bgra GL_APPLE_aux_depth_stencil GL_APPLE_client_storage GL_APPLE_element_array GL_APPLE_fence GL_APPLE_float_pixels GL_APPLE_flush_buffer_range GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_packed_pixels GL_APPLE_pixel_buffer GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_specular_vector GL_APPLE_texture_range GL_APPLE_transform_hint GL_APPLE_vertex_array_object GL_APPLE_vertex_array_range GL_APPLE_vertex_point_size GL_APPLE_vertex_program_evaluators GL_APPLE_ycbcr_422 GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_IBM_rasterpos_clip GL_NV_blend_square GL_NV_conditional_render GL_NV_depth_clamp GL_NV_fog_distance GL_NV_f
Could you please try creating a new catalog for testing purpose and then try to plug in your flash card and check whether it triggers Lightroom to open or not?
I did that. Inserting a flash card, in the Library module, did not trigger the import dialog. To be specific, I started LR with the option key down, which gave me a choice of catalogs, and the. I chose New Catalog. Once its location was specified, LR started and then I inserted a flash card from one of my cameras.
Try unplugging the flash card, close Lightroom then insert the card again and see if Lightroom launches.
I think there is a problem with how I described my situation. I am NOT trying to get LR to launch upon insertion of a fl;ash card. This is something that on a MAC is done by altering a setting in the Apple Image Capture app.
I am trying to get LR to switch to the import dialog when it is running and detects a memory card. This is set by one of the general Preferences.
FYI, if i do set the parameter in Image Capture and then quit both Image Capture and LR, then inserting a flash card does make LR launch.
I do not keep my system set this way. Insertion of a flash card does not launch any application.
Please reset the preferences of Lightroom : -
- Quit Lightroom.
- Open Finder and select the Go menu.
- Hold down the Opt key so Library appears in the menu, then click on Library.
- In the Finder window, open the Preferences folder and scroll down to com.adobe.Lightroom6.plist
- Move this file*, plus any other Lightroom preference files (e.g. com.adobe.Lightroom6.LSSharedFileList.plist or older versions), to another folder or delete them.
- Reboot your computer (because OS X caches some preference files), then restart Lightroom.
I did this. After doing what you described, I started LR and it went to the library module as one expects; then I inserted the flash card from my camera and Photoshop CC started! That was surprising, since I had not visited PS in the past six months!
All I can think of to do now is to uninstall both LR and PS using the Adobe uninstaller, and then download both and install them using the CC icon in my menu bar. But I await further advice.
Don't bother uninstalling and reinstalling.
IIRC this is a bug and hasn't worked correctly for a while now. You'll just have to get use to clicking the Import button.
Ah so! Yes, i'll give up. I thought it was ME!
Perhaps Adobe should get used to its clients being unwilling to pay the full price for a product that has lost some of its very BASIC functionality. Is this customer-friendliness? Where are the programmers that can actually debug? Why do we have to pay for something that doesn't function correctly? Would you accept paying for a car that you have to start up each and every time by pushing two buttons instead of one?
Every week or so there are whistles and bells being added to LR mobile instead of concentrating on at least TWO MAJOR BUGS in LR CC, one of which I have reported FOUR YEARS ago, the other FOUR MONTHS ago.
And yes, I am ANGRY. We are all paying for something that does not function and doesn't get repaired.