I recently opened a notebook of mine and discovered all the various cells (input output, headings, graphics etc) had been converted into one big input cell, complete with date, time etc for each line. I show one line here:

12/17/15 16:58:02 In[378]:= ImageChannels[%]

After laboriously recreating the notebook by cutting, pasting, styling, and after working with it successfully for a while, I saved it and quit mathematica. When I reopened it, the same problem had returned! Why did this happen and how can it be avoided?

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    $\begingroup$ I've never encountered this before but please provide details of what version of Mathematica and your operating system $\endgroup$ – Mike Honeychurch Dec 18 '15 at 2:08
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    $\begingroup$ This is not the first question about that. $\endgroup$ – Kuba Dec 18 '15 at 6:19
  • $\begingroup$ Mathematica 10.3, Apple OSX 10.11.1. $\endgroup$ – abwatson Dec 18 '15 at 19:36
  • $\begingroup$ When I opened the corrupt file in a text editor, there was none of the usual header lines such as (* Content-type: application/vnd.wolfram.mathematica *), only text. I have been able to cut and paste the content into a brand new notebook and all is well. $\endgroup$ – abwatson Dec 19 '15 at 17:51

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