It is best to set RenderMan IPR to leave some CPU cores free for Maya and HDR Light Studio to use.It is possible to override this in HDR Light Studio and set it to use HDR, but this will cause Maya on MacOS to crash when used with RenderMan. HDR Light Studio will default to using the EXR file format for its content when used with RenderMan.It also does not occur when exporting the scene, or when using another renderer (tested with Arnold), so it seems to be RenderMan 22 only. This only occurs on Mac OS, and does not occur if the scene is imported first, and then the HDRLS frame buffer is started nor when starting the IPR inside Maya first and then importing the scene to HDRLS. On Mac OS, if the user imports the scene across to HDRLS after they have started the HDRLS frame buffer, the 'please wait' message will appear on the render view but it will not load, and Maya will hang in the background. Pixar know about the issue and are looking into it. You can still use the connection with RenderMan 23.1, looking at the IPR in Maya. There is an issue where RenderMan 23.1 is not currently sharing the IPR render image with the HDR Light Studio interface.
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