IsaacSim 4.5 completely freezes

Omniverse Isaac Sim
1

Hey!

I have a serious issue with 4.5. I’m setting up a scene with some conveyors and people walking around and everything works great. I then added some new assets from SimReady and when trying to start the simulation again, IsaacSim completely freezes.
The scene was not saved, so I restarted isaacSim, opened the scene without the new assets and it still freezes.

I had the same issue yesterday, which I could only resolve by ‘reinstalling’ 4.5 (unzipping, removing all caches) and recreating my scene, which took me quite some time.

What do you need in a full bug report? This currently blocks my development completely.

2

Please check for any error messages in the log files at ~/.nvidia-omniverse/logs/Kit//4.5/.

3

Apologies in advance if I hijack the thread, but I do not know if it is better to open a new topic insofar as I have the exact same issue. I cannot go through the second quickstart tutorial (Quickstart with a Robot — Isaac Sim Documentation) without freezing. This makes IsaacSim unusable. I reinstalled everything once, to no avail. Can someone please help?

Also, I can see some errors in the logs, but I have no idea how to resolve that. The end of the log is as follows:

Blockquote
2025-04-07 11:39:24 [36,296ms] [Info] [rtx.neuraylib.plugin] Stored MdlEntitySnapshot to DB: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/Aluminum/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((39))
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Structural change on shade node ‘/Franka/panda_hand/geometry/Looks/Aluminum/Shader’. Initiating database and shader updates.
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Start creating rendering material for prim ‘/Franka/panda_hand/geometry/Looks/Aluminum/Shader’: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/Aluminum/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((39))
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Setting new rendering material for prim ‘/Franka/panda_hand/geometry/Looks/Aluminum/Shader’: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/Aluminum/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((39))
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Resolved MdlEntity function overload for prim ‘/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader’ as ‘::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR(color,texture_2d,float,float,float,color,float,float,texture_2d,float,float,texture_2d,float,bool,texture_2d,float,texture_2d,bool,color,texture_2d,texture_2d,float,bool,texture_2d,float,bool,::base::mono_mode,float,float,float,texture_2d,float,texture_2d,bool,bool,bool,bool,int,float2,float,float2,float2,float,float2,float,float,bool)’.
2025-04-07 11:39:24 [36,297ms] [Info] [rtx.neuraylib.plugin] Stored MdlEntitySnapshot to DB: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((40))
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Structural change on shade node ‘/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader’. Initiating database and shader updates.
2025-04-07 11:39:24 [36,297ms] [Info] [omni.hydra] Start creating rendering material for prim ‘/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader’: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((40))
2025-04-07 11:39:24 [36,298ms] [Info] [omni.hydra] Setting new rendering material for prim ‘/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader’: usd::rtx_scope0::/Franka/panda_hand/geometry/Looks/PlasticWhite/Shader::::Z73file_3A::home::fom::miniconda3::envs::isa1::lib::Z0Cpython3_2E10::ZC9site_2Dpackages::omni::mdl::core::Base::OmniPBR::OmniPBR((40))
2025-04-07 11:39:24 [36,299ms] [Info] [rtx.materialdb.plugin] Nonvisual material ID (0) was not set because legacy CSV was enabled by setting
2025-04-07 11:39:24 [36,341ms] [Info] [omni.kit.manipulator.prim.usd.data_accessor] Tf.Notice.Register in PrimTransformModel USD
2025-04-07 11:39:24 [36,341ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Create
2025-04-07 11:39:24 [36,343ms] [Info] [omni.appwindow.plugin] Created window: width=210,height=114.
2025-04-07 11:39:24 [36,343ms] [Info] [omni.kit.renderer.plugin] Attaching default app window “omni.ui.scene.Widget”
2025-04-07 11:39:24 [36,350ms] [Info] [omni.kit.imgui_renderer.plugin] Creating font texture 1024 x 3240
2025-04-07 11:39:24 [36,394ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Edit
2025-04-07 11:39:24 [36,457ms] [Info] [omni.ui.scene] omni.ui.Widget(0xa748c70, frame.name=‘’, frame.identifier=‘’) transitioned to frozen=1
2025-04-07 11:40:40 [112,616ms] [Warning] [carb] Plugin interface for a client: carb.physx.supportui.python was already released.
2025-04-07 11:40:40 [112,616ms] [Warning] [carb] Plugin interface for a client: carb.physx.supportui.python was already released.
2025-04-07 11:40:40 [112,619ms] [Warning] [omni.usd] Warning: in SdfPath at line 81 of /builds/omniverse/usd-ci/USD/pxr/usd/sdf/path.cpp – Ill-formed SdfPath <>: syntax error

Blockquote
2025-04-07 11:40:40 [112,619ms] [Warning] [omni.usd] Warning: in SdfPath at line 81 of /builds/omniverse/usd-ci/USD/pxr/usd/sdf/path.cpp – Ill-formed SdfPath <>: syntax error

Blockquote
2025-04-07 11:40:40 [112,624ms] [Info] [omni.physx.plugin] Using CUDA device ordinal 0.
2025-04-07 11:40:40 [112,667ms] [Info] [omni.kit.widget.layers.layer_model] Load sublayers of layer anon:0x76ec9c0045b0:World0.usd.
2025-04-07 11:40:40 [112,667ms] [Info] [omni.kit.widget.layers.layer_model] Load sublayers of layer anon:0x76ec9c00b400:World0-session.usda.
2025-04-07 11:40:40 [112,667ms] [Info] [omni.kit.widget.layers.layer_model] Load sublayers of layer anon:0x2511f730:/articulationsAuthoring.
2025-04-07 11:40:48 [120,254ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Create
2025-04-07 11:40:48 [120,263ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Edit
2025-04-07 11:40:49 [121,844ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Create
2025-04-07 11:40:49 [121,851ms] [Info] [omni.kit.menu.utils.utils] omni.kit.menu.utils.refresh_menu_items Edit
2025-04-07 11:41:07 [138,891ms] [Info] [omni.physx.plugin] Using CUDA device ordinal 0.
2025-04-07 11:41:07 [138,923ms] [Info] [omni.physx.cooking.plugin] ConvexMeshCookingTask: polygon limit reached, resulting convex hull may be suboptimal. Prim

EDIT:
In the terminal that I call IsaacSim from, during loading, I get this:
2025-04-07 11:38:59 [11,257ms] [Error] [gpu.foundation.plugin] No carb::graphics::DescriptorSet for pool 1 on device 0

EDIT2:
The [gpu.foundation.plugin] message reported above is not consistently present.

4

I have the same problem. The Isaac sim freeze when I load the Franka robot and try to control it. Please fix this problem. Thank you!

5

@szheng21 Could you please create a new topic with the details of your issue and reference this topic in your post?

6

@FooTheBar Could you provide the full log? Have you ever enabled the isaacsim.code_editor.vscode extension before encountering this issue?

7

Hello!

We noticed that this topic hasn’t received any recent responses, so we are closing it for now to help keep the forum organized.

If you’re still experiencing this issue or have additional questions, please feel free to create a new topic with updated details. When doing so, we recommend mentioning or linking to this original topic in your new post—this helps provide context and makes it easier for others to assist you.

Thank you for being part of the NVIDIA Isaac Sim community.

Best regards,
The NVIDIA Isaac Sim Forum Team