Yes 4 months is a long time unless you have credit issues and they are waiting for your credit score to go up. Is that the case?
Also, if they say it's the title company's fault, is it a question that the title is not clear and they are working on clearing it. Are you sure that the mortgage company can do a loan on a manufactured home? the guidelines for those are even stricter.
Is this for sure a foreclosure or a short sale? Foreclosures don't take much time but short sales can take up several months.
You need to get more details from your loan officer.