If you change the name of a notebook by clicking on the notebook title in the browser, and the new name includes a colon, the notebook is "saved" without objection, while in the background the ipynb file is wiped -- the filename is truncated at the colon and the file is empty. This is not apparent in the browser until you close the notebook. This is on Windows.
I discovered this by successively changing the names of a set of 5 notebooks to include colons, and continued to make changes to the notebooks, saving, etc. Then I closed them and later went to re-open them to discover everything was gone. There was never any warning at all while in the browser. Given that there is no warning that the notebook title == filename and colons are a fairly common character, this strikes me as a pretty serious issue!
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