Burkhard's just announced this as FW 5.4.1.13437, but I'm guessing it's a typo and have therefore "fixed" it for this thread's title.
He said:
This operating system introduces the following fix:
User Interface
fixed: Strobo Tuner inaccuracy
It's no doubt an "amendment" to the v5.5.1.13417 public beta and specifically addresses this issue. Many have commented about it on the board, so this should please those people.
Thank you, and well done, team!
EDIT:
It would be helpful if comments here could be restricted to the tuner fix alone and issues relating to the v5.5.1.13417 public beta are discussed in the relevant (May 31st) thread:
FW 5.5.1.13417 Public Beta Feedback Thread - Discuss Non-tuner Issues Here
After all, the ball is already-rolling in that one and there's no sense in splitting up the issues discussed there.