I don't recall seeing this one mentioned, but it bugs the hell out of me:

After quoting someone, the first keyboard return is ignored and treated like a line no-space line break, which leaves no space between paragraphs, even though, in the text editor box, it clearly shows a new paragraph. Putting in an extra return to avoid this, however, doesn't work, as the first actually shows up then and you get a really big space.

Not a bug but... the huge difference in font size between quotes and posted text is silly and extremely unfriendly to people with vision problems who use larger fonts. In fact, the relationships between the sizes of various elements (icons vs text, banners vs text, etc, etc) is completely out of whack. The entire site needs to be tested for ACCESSIBILITY, otherwise it's seriously discriminating against the vision/hearing/mobility impaired. And while that's totally legal, it's superbly bad customer service.

Quotes should show the username of the person quoted.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.