SQL ERROR [ mysqli ]

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Emoticons are shown either from the image stash provided by WP (see any edit window) or they're image files from some other site - gif, jpeg, png and so on.

The WP emoticon set is represented in posts as escape sequences - for example

will display as in a previewed or submitted post.
No Unicode is involved at any point - it's a simple substitution operation.

That you saw :happy: would indicate something trying to use the same method but that sequence doesn't have a corresponding image, so it's just displayed literally.
As with :rooster: or :flag: for example - they're not known to WP.

But no Unicode characters are inserted by WP into posts - for obvious reasons!

I was going to post to congratulate whoever does the tech stuff for fixing the SQL error and stopping the pages from freezing, but CloudCrap just tried to eat a long post I'd written. I've been free of CloudCrap's nonsense for so long that I was getting careless and not always copying my post before submitting it, but by a stroke of luck I managed to get it back again by pressing the back button a few times.

Still, 2 out of 3 problems solved, and the other problem not fatal as long as I perform the correct ritual. So, a qualified "well done" is in order. WP is free to use, so I don't expect a marble staircase.