Macro Disappeared.

Macro Disappeared.

I have had a sheet with a Demo VBA-Macro since may 2011  that I occasionally start. It is a demo for an interview that I still sometimes use as an example.
  
After this my macro has disappeared from the file and its history. So even if I go back to versions from 2011 the Macros/view  reports the sheet as not having any macros.
I am wondering if the location where the macros are stored may have become unavailable. 
I then opened another sheet with a macro, it had disappeared too. 
Am I the only one? I have switcehd off all ad-blockers and Uorigin etc, but the problem stays. 

Am I the only one? 

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