Monks and nuns are human beings, and for the most part, have not yet attained to the "ideal sangha" which is the object of refuge. Don't be too disappointed when human difficulties arise, and even scandals, but respond to them appropriately. For example, if there is not enough money, or someone has been skimming, then to the extent that your role allows this, help them do what has to be done, as your role permits. Sometimes nothing can be done, and the whole place falls apart. Eventually this happens to everything, so don't be too surprised or disappointed.
But accounting for funds received and disbursed is a basic requirement. If those with responsibility over the money have neglected to do this, they are likely commiting not only a religious offense, but a secular crime. This should be impressed on all involved. Go ask a nearby church or synagogue what structures they have put in place to handle money--typically they will be quite wise to all the ins and outs. Enlist the involvement of lawyers and/or accountants in your dharma center, for example, by putting them on the board of trustees.