Hello,
I found Spine 3.6.53 editor does not executed on my macs(iMac 5k, Macbook Pro) installed lastest OS Big Sur.
I tried to uninstall Spine and re-install and found new launcher executed first. I could select Spine editor version so I choosed 3.6.53. After that, Spine opened with 100% scale UIs so it seems too small in my iMac 5k.
It seems Spine editor crashs and down when I set like as below.
1) The UI ratio as not power of 50% - like as 175% or something
2) Interface linear filtering ON
I think some process about HiDPi support changed with lastest version and it makes this happen...
Can you check about this?