What are the most important problems of Spinoza's metaphysics? Spinoza was not panpsychist. Consider:
Ethics, Of God, Definition #2:
"A thing is said to be finite in its kind if it can be limited by another thing of the same nature. For example, a body is said to be finite because we always conceive bodies that are greater. Similarly a thought is limited by another thought. But a body is not limited by a thought nor a thought by a body."
In regards to God's intellect and will, there are two approaches. In Ethics,Of God, Proposition 18, Scholium:
"Since God’s intellect is the sole cause (as we have shown) both of the essence and of the existence of things, it must necessarily differ from them both in regard to their essence and to their existence. For the thing caused differs from its cause precisely in what it has from its cause. For example, one human being is the cause of the existence of another human being but not of his essence; for his essence is an eternal truth.
Therefore they can completely agree in their essence; but in their existence they must differ. This is why if the existence of one comes to an end, the existence of the other will not therefore come to an end. But if the essence of one could be taken away and be made false, the essence of the other would also be taken away. This is why something that is the cause of both the essence and the existence of an effect must differ from that effect both in respect of essence and in respect of existence. But God’s intellect is the cause of both the essence and the existence of our intellect. Therefore God’s intellect, insofar as it is conceived as constituting the divine essence, differs from our intellect both in respect of essence and in respect of existence, and it cannot agree with it in anything except name, and this is what we set out to prove. One may make the same argument about will, as anyone may easily see." (Spinoza does make the same argument for will in Proposition 33)
The other approach is to see it as prejudices of human beings such as discussed in the Appendix to Proposition 36. It is long so I will only quote a snapshot:
"After human beings had convinced themselves that everything that happens, happens for their own sakes, they were bound to believe that the most important thing in everything was what was most useful to themselves and to put the very highest value on all those things that affected them most favorably. Hence in order to explain the natures of things, they found themselves obliged to form the notions of good, bad, order, confusion, hot, cold, beauty and ugliness. Also, because they believe themselves to be free, the following notions arose: praise and blame, sin and merit. I will explain the latter set of terms below after I have given an account of human nature, but the former set I will explain briefly now."
Which attributes do not interact with each other? Are you referring to Ethics, Of God, Proposition 28?:
"Proof:
Any particular thing, or anything that is finite and has a determinate existence, cannot exist or be determined to operate, unless it is determined to exist and operate by another cause, which is also finite and has a determinate existence; and this cause in turn is also unable to exist or be determined to operate, unless it is determined to exist and to operate by another thing, which also is finite and has a determinate existence, and so ad infinitum.
Scholium:
Some things must have been produced immediately by God, namely those things that follow necessarily from his absolute nature, and some things by the mediation of these first things, which still cannot either be or be conceived without God. It follows therefore, first, that God is the absolutely proximate cause of things immediately produced by him but not in their kind, as they say.24 For God’s effects cannot either be or be conceived (by p15 and p24c) without their cause. It follows, secondly, that God cannot properly be said to be the remote cause of particular things, except perhaps in order to distinguish them from those which he produced immediately or rather which follow from his absolute nature. For by a remote cause we mean the sort of cause that is in no way closely joined to its effect. But everything that is, is in God, and is also so dependent on him that without him they could neither be nor be conceived."
[All citations come from
Spinoza: Ethics: Proved in Geometrical Order (Cambridge Texts in the History of Philosophy)]