PROVIDENCE — The Twin River bankruptcy filing on June 23 has put a number of businesses in scramble mode as they try to collect money owed them by the corporation, including the company hired to help find a buyer for the Lincoln gambling venue to avoid bankruptcy.

Blackstone Advisory Service LP tops the list of the 40 largest unsecured creditors of UTGR Inc., the entity that runs Twin River. Blackstone, a leveraged-buyout firm, began working with Twin River and the state in mid-2008, along with the Willkie Farr & Gallagher law firm, to help UTGR restructure its finances.

The restructuring didn’t yield a workable plan, and Blackstone now claims UTGR owes it $500,000, according to a filing with the U.S. Bankruptcy Court in Providence. Second among the unsecured creditors is the Rhode Island Greyhound Owners, owed more than $220,000.

It is the financial arrangement with the dog owners’ association that investors behind UTGR and its parent company, BLB Investors, blame for some of their money troubles. The investors say it costs Twin River $2.5 million annually to run greyhound races, and they must pay a $9.7-million subsidy to the dog owners. Twin River only brings in $1.75 million in revenue from the races, leading to a more than $10 million annual loss.

The House voted Friday to allow round-the-clock gambling at the Lincoln track and slot parlor seven days a week, and force the current owners to drop their plans to suspend live dog racing on Aug. 8, and run a full 200-day season.

Legislators approved the measure despite strong warnings a day earlier by Gary Sasse, the director of the state Department of Administration, who said the state could lose upward of $25 million in needed gambling revenue if legislators interfere with the restructuring plan.

pgrimald@projo.com