Press reports say that Broward County is still "counting ballots", I assume they really mean that the optical scanning machines are still reading the ballots and tabulating the votes for each candidate and issue.
I further assume that these optical scanners are located at one central location, and that election board employees are feeding the scanners. (unlike at my precinct in Ohio where there are scanners at each polling place and the voter actually feeds his/her ballot into the scanner).
I see that the Broward County ballot is actually 5 pieces of paper, (10 pages of ballot) and I surmise that all ballots in the county are not the same (may be some very local issues (sub-county level voting). So it may be necessary to group ballots by precinct when counting votes.
So is the problem largely a deficiency in the number of scanning devices? Or is there some other mechanical problem?