in your midi track, just move that C# up to a D natural, and draw in pitch data to lower the sound a half step. If pitch data interferes with adjacent notes, you could always place that note/s in a separate midi track.
Thanks Dan. That would certainly work, but I have to agree with Nickie that an official fix would be the better solution. Aside from this glitch, this is one of the better voices in the entire GPO package.