Huh? That's really weird, that never happened to me. At first, it wouldn't recognize that I said anything, like it recognized my voice but the black dots just sat there. But then I installed the offline voice recognition pack and it worked like a charm. Maybe you could provide a screenshot?
I am a VZW Xoom running the stingray version maybe there is something different with the wingray version i will flash it and let you know if i have the same problem or if i get your results.