Yeah as I suspected that's a crash inside Qt, something to do with syntax highlighting. Likely trigerred by the newer Qt version in calibre 4. Is there something unusual about your systems? calibre plugins? Qt plugins? Hard to debug without being able to reproduce.
Can you try running the editor like this:
CALIBRE_CONFIG_DIRECTORY=/tmp/cc calibre-debug -t
this will run the editor with all default config settings and no plugins. Does it still crash?
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