Salvaging has not been nerfed or has it been broken. The way salvaging works now is it is a child skill of repair and fishing. I found this out after doing a bit of research online last night on the McMMo wiki. It turns out that you no longer need 600 repair to salvage as it is now a child skill. If you do /salvage you will realise why you only get a certain percent of the item back and sometimes get enchanted books when salvaging enchanted items. I have posted this here as to many people are saying it is a bug. Thanks, Shadow_Hopper
They changed the salvaging to what its actually meant to be, originally it was meant to only give you partials ore back, unless it is over 1000.