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Just upgraded to 1.9.23 and the same problem exists as with 1.9.22.
There appears to be a conflict with the TinyMCE Advanced plugin. Both 1.9.22 and 1.9.23 deleted all the options from the TinyMCE Advanced plugin in my editor and wiped out all the text that I was writing.
I rolled back to 1.9.21 and the problems go away.