Hi @Gijs , seems like I forgot to reply here earlier. I just discovered the reason why I see that strange bug. It happened again now when I did the following steps:
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I removed a custom display mode from Rhino settings > View > Display modes > Delete. Once I did that, I forgot to press the “OK” button at the bottom to close the pop-up window!
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Then I deleted the *.ini file of the same display mode from the folder where it was saved, while it was still active in the viewport in Rhino 7 (since I forgot to press the “OK” button, as mentioned above). For some reason that preserved the display mode inside Rhino 7, despite the its *.ini file no longer exists;
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Then I repeated step #1, but this time I removed the display model and clicked “OK” to finally remove it from Rhino 7.
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This seems to corrupt the file forever (I didn’t saved it after the removal of the display mode), because the bug with random disco-like lights and real-time reflective environment map showed up again upon the next start of Rhino 7 and opening the same file.
The latter looks like having the same bug which I reported in another topic: