WGT, please read this - now it's really a bug report:
Finally, today I succeeded, as you can see here:
BUT, I did not receive the according diamond accuracy award. This has been a lot of work, and I am not rewarded. Please, dear WGT team, check it out! The result has been recorded in my score history.
Just a guess: the game stalled when I clicked the "view replay" button on hole 3 (I wanted to save this one, because it was nearly a hole in one). So I closed the window after waiting for some minutes, opened a new play window and continued the round. Maybe this is the reason that the number of consecutive shots has not been counted correctly?