Advocate IIIHi Anonymous ,
this is most definitaly a bug introduced in Power BI Desktop in the March update and a very annoying one at that. It should have a very high priority imho since it seriously affects the user experience as a report designer in a negative way.
What's more, I believe the problem described above by @contezini is only part of the problem. What also happens (and what I think is related) is that tables sometimes do not update their values correctly when changing filters in the filter pane. Maybe it does not have the exact same cause, maybe this is related to the new slicer functionality, but it does show the same behavior in a way. In both cases, switching to a different tab and switching back to the tab where you experience this issue, corrects the problem (at least, for that one instance, because the next time you click a table or visual, you might encounter the same problem).
I too don't yet have the new on-object option switched on.
What I believe happens is that Power BI Desktop does not correctly updates the focus on the visuals (in the formatting pane). What happens is that often when selecting a visual, it will show me the options for the background in the formatting pane instead of the formatting options for that selected visual. However, sometimes it shows me options for a completely different visual instead? For instance, just now when selecting a table, I was shown the formatting options for a line (a shape) on the same page instead.
Please fix this very soon as it makes it very hard to develop a report this way.
Thank you!
Cheers,
Niels