Hi Joe,
Which version of software did you update from? The last couple of versions have not introduced BB60C changes.
Can you provide a screenshot of the frequency offset including all settings? I can try to recreate the issue on my end.
We haven’t introduced a frequency offset setting yet in Spike.
The reason you see the “To Center” behavior is because the RBW is changing as you decrease the span. The frequency accuracy is subject to the RBW. As you decrease span, the frequency accuracy gets better, which is why you see an offset as you decrease span.
Feel free to follow up with me via email and we will look at your BB60C frequency offset issue.
aj at signalhound dot com
Regards