Commonwealth of Massachusetts professional licensing board of
registration has stalled due process in handling a closure of business and
suspension of personal registration.
that depends on the reason for the "stalling." If they have a huge back log of cases, you might just have to wait your turn. There can be due process concerns if they make you wait until evidence that helps you evaporates.
I noticed that you posted the question 11 months ago, which would certainly be far too long to wait for a state Board to issue or deny a license. My practice is limited to California, but any state agency that is "investigating" a case to determine whether to grant or deny a license should do so in a reasonable period of time. Even if a State Board denies a license in California, they have to offer the applicant an opportunity for a hearing - to comply with due process.