I have a verbal employment contract with my current employer, whom I have been employed with for almost two years. New terms were negotiated in October as a result of my being offered a position with a different company. Are the terms of this contract enforceable if they are not being followed?

That is a very good, but potentially complicated, question. We would need to know more about the circumstances under which the contract was signed, who is breaching the contract and what terms they are breaching. We would also need to see the content of the contract itself, primarily to see if it contains a "severability" provision, which could mean that the breach of one provision might leave the rest of the contract intact. I strongly recommend you contact an employment lawyer at the number below. How you respond to a breach of contract is very important.