We have been living in a house for 8 months. The wet bar was converted to an office. In the last two days, we've called in a plumber twice to snake the pipes which were stopped up. Now the smell in the office is almost unbearable. What could be the cause?

Did you run new water into the drain to refill the trap? If so call him back, he should be garrantying his first job, hope you didn't pay for job #2