sixes and sevens

[GrumpyPom]

where does the phrase sixes and sevens originate?

TIA

[Quizmonster]

By far the most likely explanation is that it came from an old dice-game. ‘To set on six and seven' - a phrase that dates back to the 1300s - meant to risk a fortune on the roll of dice. ‘Six and seven' is actually a corruption of the Old French phrase ‘cinque et sice', meaning ‘five and six', these being the highest numbers on a die. The earliest recorded use of the words in English appears in Chaucer. The plural ‘at sixes and sevens' became the normal form of the phrase by the 18th century and had taken on the meaning we know today...involving confusion or disagreement. The idea that it has anything to do with an argument about the rank-order of London Guilds has been dismissed. The Chaucer usage alone predates that by almost a century. Click http://www.worldwidewords.org/qa/qa-six1.htm for even more information.

[cruciverbali]

http://www.credoreference.com/entry/orionpf/six#opfb19952

[Quizmonster]

I couldn't get any further into Cruciverbali's link above than to discover it refers to Brewer's Dictionary of Phrase and Fable. In that book itself, it says (quote), "The phrase probably comes from an old dice game" and later, "However it is traditionally held that...dispute...livery companies." So what should we go for...a probability or a traditional belief? It's almost a 'traditional belief' that the word 'posh' is an acronym of Port Out Starboard Home. It isn't.
The link in my earlier answer- from a noted etymologist and lexicographer - refers to the same matters, but dismisses the 'traditional belief'. So, effectively, does The Oxford English Dictionary and so, given the dates involved, should the rest of us.