[arasina]

Yankee Clipper? That's what I use and I've almost had the same 'embarraskin' result.

I always try to remember the extra 'P' step: Cut, Paste, Preview, THEN Post. :o)

[Bloody Sam Roberts]

Yankee Clipper?

Yep. That's him.
Actually, I've found the culprit to have been an extension I use with my Firefox called "Autocopy". It copies whatever you highlight...no right click necessary. It had somehow become disabled making the previous cut, the current cut and when I pasted without Previewing....blech.