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I just recently upgraded to Sierra myself and found that some window
operations would make Simile crash, with the crash report mentioning
'CALayerInvalidGeometry'. This seems to be a problem with the TclTk
included in the OS, which is version 8.5.9. It can be fixed by loading a newer TclTk, either
downloaded from ActiveState or built locally using Homebrew or Macports.
After installing this you have to replace the symlink
in '/Applications/Simile v6.7 64-bit.app/Contents/MacOS' with one to the
new Wish executable.
I would like to fix this by including a newer TclTk
with the Simile distribution, but it might be hard building one that
will also work on older Macs.