Yes it is. Spell checking works perfectly in vB.x and always has.
In xF sometimes it works sometimes it doesn't. For example...when a word is spelled incorrectly the lines appears (sometimes) and the word is hi lighted when you control click (Safari). But, sometimes it isn't hi lighted and you have to "spell check now" to get it to work semi properly. It's a xF bug --- pretty certain. Never had the problem before and still don't on any other forum software. Have had the problem sporadically on several forums I belong to who have switched to xF. Hope they can track this down and fix it.