Discussion in #338 revealed some dubious scale! methods. For example (#338), determining what either of

scale!(A::AbstractArray{T<:Any,2}, b::AbstractArray{T<:Any,1}) at linalg/generic.jl:477
scale!(b::AbstractArray{T<:Any,1}, A::AbstractArray{T<:Any,2}) at linalg/generic.jl:478

does requires reading the associated code. And as @Keno suggests, expressing these operations as e.g. A*Diagonal(B) might be better. Best!