I have had a problem with some of my rose blossoms not opening this spring. It sounds like your rose blossoms were attacked by thrips. Thrips are small insects that are sometimes hard to find that get into the buds of many flowering plants. Their feeding results in the bud not opening as you described.
Thrips are hard to control as they are inside the bud safe from the chemical sprays.
Products such as Orthene, Sevin and Malathion provide some benefit. Make two to three applications at three to five day intervals for best control.