When you have the last most material selected (sometimes) you cannot add a NEW material, * you have to go back to an earlier material index
Not a big issue, but does cause some frustration... the DELETE button is very close to the NEW material. I accidentally hit it deleting mercilessly a material i had added.
Is it possible to add something like a [ OK to delete material or Are you sure? ] question after clicking DELETE?
or perhaps move the DELETE button lower by adding a separator or something to space them apart would be much easier solution