People trying to change Cuyahoga County's governing structure have hit a pair of problems. The county Republican Party and Citizens League of Greater Cleveland want to replace the three-member board of commissioners with an 11-member council and an executive. They're trying to get the initiative on the November ballot. But the board of elections tossed thousands of signatures yesterday and referred the matter to the prosecutor's office because of possible fraud in obtaining some of them. In addition, some business leaders and Democrats say they'll campaign against the effort because they don't think it's been inclusive enough. Supporters, who have until September third to get the required number of signatures, say they're confident the measure will be on the ballot.