Using 100 for "Samples to include" will cause the upper graph to look at 100 samples. When you double-click on the lower graph, it *does* focus the upper window, but it focuses the "start" of the window, rather than the end of the window. The "Current" sample number is always the last one in the window. The window is enclosed in the lower graph by a focus rectangle - and the "Current" number is the very most right-hand sample in this window - the dotted line that shows the focus actually covers the current sample.<br><br>Because you always double-click on the start of the period you're trying to focus on, there has to be enough samples to not stay focused on the current (this is a bit hard to explain). Let's say you have 200 samples total in memory, and you have your "Samples to include" set to 100. If you double-click on samples 101 or higher, you won't get a change in focus. If you want to focus in on samples 1 to 100, you need to double-click on sample 1 - which would make the "Current" time display sample 100. You're right, this may need a review . This inconsistency really only affects things when you're looking at the current sample, though (which is something I don't do - and the reason I've never noticed this oddity).<br><br>100 may be a bit too big to try and focus in on (depending on your data and your needs). If you're interested in the "Current" numbers, then including the stats in on 99 other samples may make things harder to read. If you're only interested in the current number, you might try setting "Samples to include" at 1 - which would always only look at the sample you double-click.<br><br>Feel free to re-direct. I'm afraid the explanation I've offered here may not be quite as clear as I like.<br><br>