Or, as I've written before, …
if G-d, then for all
{ X } G-d != { X }
The Problem of Evil is the Problem of Anthropomorphic Projection.
Actually, there is something of a problem when we start talking about omni ... whatever. The concepts are themselves basely illogical, and one in particular basally blows the issue out of hand.
Specifically, omnipotence is illogical. It means, literally, that anything is possible. As in ANYTHING. That would include taking the rules of logic and handily ignoring them.
For example, can an omnipotent being make something so massive that even he could not move it? Of course, such a thing is possible. Could he then, illogically, turn around and lift that thing he just could not anyway? Yep. Because EVERYTHING is possible.
When we attempt to limit these concepts by applying logic to them, we, in the very act of doing so, place boundaries upon these claims that can be violated anyway.
The question isn't really whether something COULD be done by an omnipotent being, but whether such a being WOULD do such a thing - assuming that an omnipotent and omniscient being understood the basic premise of logic - which would seem to be a valid hypothesis given the boundaries of omniscience - IMHO anyway.
The real question of the problem of evil is whether or not evil needs to exist? If we are here to learn and grow, to understand the importance of ethics, then it would seem that consequences for our actions MUST be in place to reinforce these lessons. That would include allowing people to BE evil and do evil things that they themselves might learn, and that others might see them and learn.
Is there a logical problem of evil for an omnipotent and omniscient 'God'? Nope. Attempting to apply logical boundaries to premises that are basely illogical is about the equivalent of attempting to logically reason with an disassociatively insane person.
Is there an ethical problem for such a God? Perhaps. Then however, the question become what our lives would be if evil choices were not permitted, and that, IMHO, would be a form of slavery. Allow some to choose evil or all to be enslaved? That is indeed something of an ethical pickle, but one I personally do not think a 'God' would be on the wrong side of by allowing people to make bad or otherwise evil choices.