Whenever I switch from html mode to visual mode while editing posts I notice this:
2) a mere switch from text to html mode changes the post enough that WP prompts me to "stay on the page" or press "update" first.
3) custom html is either not saved or renders inaccurately in browser.
I have also read several other posts about this but nothing seems to apply to this case.
I disabled plugins, cleared browser cache compulsively.
Also experimented with tinyMCE alternatives but these symptoms persist.
I'm now also unable to make backups and the developer whose plugin had afforded me this luxury rarely utters a comprehensible phrase. Subsequent reinstalls do not offer relief.
If you know a protocol to follow or better place to be looking for it god bless you today.