v21.4 Randomly ceases ability to copy and paste code and displays the wrong code for page

What is going on? Why does this happen? No keyboard shortcuts work... going to Edit > Select All is ignored, too... 

I can type in code, but no clipboard ops?

Save is also Disabled? Are you kidding?  

When I try to Save As, it tries to save a completely different page in the editor - the first tab,, not the current active tab!

When I try to then save the first tab, I get this cryptic message: 

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Dreamweaver
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The file you just saved is also open in this window.
Reload the saved version in this window and lose changes?
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Yes No
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What on Earth does that mean? I just bloody saved the file, of course it is open in the window...

 Whati s happening, Adobe?