Hello Mark,
I can explain what you are seeing, and clarify the difference in behavior between the old software and new software.
As you know, a frequency bin in a sweep rarely lines up nicely on an even number like 10MHz. When you enter a marker frequency like 10MHz the closest frequency bin has to be used, and it might correlate to a frequency like 9.999037MHz. The old software simply printed the frequency you entered even though it was using the frequency bin at 9.999037MHz while the new software will simply show you the frequency of the bin used.
Ultimately both versions of the software use the same frequency bin to report the amplitude but the old software shows you the frequency you entered and the new software shows you the actual frequency of the marker.
Let me know if you have further questions.
Regards,
A.J.
