So you mean that many crafting recipes from AE2 are disabled by the latest version of Mekanism or do you mean that many crafting recipes from Mekanism are disabled by AE2?
#1061 ?

recipes from ae2 are disabled by mekanism, I have the last version of Ae2, I try last and first version of mekanism it s same, i try to remove integration in cfg, same again.
#1061 then what i have to do ?

I'm not an AE2 dev but I think that #1061 could be releated to this.

install rv3 beta solve it.

So installing the latest version fixed your issue?
If so, please close this issue. :)