My DRs say:

Paragraph 12 D (b) shall be amended as follows:

"12 D (b) If any such charge shall not be paid when due, it shall bear interest from the date of delinquency at the rate set by the Board of Directors at an open Board meeting in February of each year;

I know George Coleburn has said if the board didn't set the rate in February there was no interest to collect, if that is what you mean.

Other than that, the assessment notice states OPA charges 1.67% per month on the unpaid balance. That is about 20% per year, give or take. I think OPA calls this a "service charge." If someone doesn't pay their assessment,  the service charges, late fees, interest, or whatever you choose to call them add up quickly on a per year basis. 

If one can't pay a bill and ends up paying 20% or so more than the bill after a year, are they worried about the semantics or the money. 

I think Maryland law places some limits on what the law calls late fees.

Are we discussing legal definitions (late fees versus interest, for example), are we discussing whether it may be 18% or 20%, or am I missing something major?