So I'm not sure exactly how this will need to be fixed but am assuming it is involved with how Adobe decodes the sound format. On my Palm Pre, certain internet radio apps would be unable to decode a certain format of sound correctly, which made the couple of radio stations using that format too fast. This I would assume is the same issue. HTC updated some coding that is not playing nice with Adobe's coding and it affects how those particular formatted sound clips work.
Either Adobe needs to update their flash player to work with the new coding, or HTC accidentally broke something that they need to fix, which requires another update on their part....if that's the case, you can bet it will have to wait for other issues.
Many times it just requires an app to be updated but Adobe isn't just a small team of devs worrying about their pet project to survive, it may be tough to get their attention to fix this tiny obscure problem on one device.