In a Notebook window in Safari, if part of a cell is selected and then dragged, it crashes Safari, and of course all changes are lost since the last save. It can be as simple as a new cell with "x=2", then highlight the "2" and attempt to drag it someplace.
Happens in IPython 0.13.1, also 0.12.1, Safari version 6.0.2.
On master (bb2d35b), with Safari 5.1.7 on OS X 10.6.8, trying to drag any text actually seems to drag the entire input div. No crashes, either.
In case it matters, this crash is happening with OS X 10.7.5, Safari 6.0.2.
There might be some way we can avoid it, but this sounds like a bug in Safari - no web page should be able to crash the browser.
I can reproduce the crash in 0.13.1, but not in master.
@takluyver is right - this is definitely a bug in Safari. I presume it was something in CodeMirror, which as been updated since 0.13.1.
But since it is fixed in master anyway, I am closing here.