My flat function is not working. I add the error message. I tried reinstalling to no avail. Any clue anyone?! Please!.. Or just the code so I can create a new function!! 
Hi, my guess is that you have evaluated some Lisp code somewhere redefining om::flat as a standard function.
Any library loaded ?
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Well it seems that it was the only help I needed. I’ve just desactivated all libraries and it was working anew… I’ll have to add them one by one to see if one is bugging when added… I definitely need flat lisps!! Cheers!!