The new Supervisor of Assessments for Montgomery County has wasted little time in offering a solution to the wooded acerage tax issue that led to standing room only county board meetings.   During the Wooded Acerage Ad Hoc Advisory Committee meeting last week, Mullen said county residents will no longer have to worry about their property taxes soaring because of a 2007 state law.   However, there is one wrinkle, if non farm timber heavy real estate goes on the market, then the property would be reclassified residential at the time of property transfer, sending taxes upward.   . .Mullen believes grandfathering is the right and fair approach.