[image] File - Worksession - Open menu. Select a simple.rws file. Result is a black viewport for several seconds, followed by Rhino closing (no crash report notice, etc.) (Update: If the attached file is small the objects in the attached file may appear briefly before Rhino closes.) The Worksessi…

This bug needs to be on the list to be fixed before Rhino 9 is released.

Hi @davidcockey , Sorry to hear that you are crashing. The RWS is not enough for us to duplicate your issue here and fix it. Can we get this file from you that is attached to the worksession? [image] You can email tech@mcneel.com and attached the file. Include a reference to the forum thread. …

[image] Mary Ann Fugier: The RWS is not enough for us to duplicate your issue here and fix it. Can we get this file from you that is attached to the worksession? This occurs independent of the particular .rws file. Attached is a set of example files. I just tried these and Rhino 9 WIP close…

[image] David Cockey: @davidcockey , This occurs independent of the particular .rws file. Not for me. I opened the rws that you provided, and I did not crash. That is how I took the image of the Worksession manager. Maybe I will get the crash with these files… I will let you know. Sincer…

@mary I downloaded the posted files onto my laptop and repeated the crash. I submitted the crash report. SystemInfo for that system is below. (SystemInfo for my desktop is in my first post.) The crash only occurs with this sequence: [image] Other ways of opening the .rws file result in it openin…

Great, @davidcockey . I was able to duplicate the crash with the last set of files and instructions that you provided. The RH-94880/RhinoCoreCRhinoDocWorkSession-Crash as been logged and assigned to the developer. We will let you know here when there is fix to test. Thanks for reporting this. Sin…

Worksession Bug - Opening RWS file can close Rhino

Serengeti (Rhino WIP)

brian (Brian Gillespie) April 21, 2026, 10:17pm 9

RH-94880 is fixed in Rhino WIP

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Worksession Bug - Opening RWS file can close Rhino

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