Popover disappears and reappears when moving mouse over other elements.
Using beta33, I can't reproduce it with beta31. In both cases I use calcite-app-components 6.1.1 and 4master.
http://devext.arcgis.com/apps/mapviewer/index.html?url=https://services1.arcgis.com/4yjifSiIG17X0gW4/arcgis/rest/services/FatalAccidents2017/FeatureServer/0
Click on the layer name on the left to make it active, open smartMapping by clicking Styles on the right, click on Location tile, open transparency block and enable it (you need stuff in the UI to see it), click on the orange dot symbol to open the symbol styler. Now move your mouse slowly down the side panel (not over the styler).
cc @jcfranco

Seems like an app issue. Only happens when the vertical slider is showing and when I move the mouse it seems to remove the popover being open.
@AdelheidF let me know if I can close this. Otherwise, we would need some kind of repro case using just components.
Neither the popover or popover-manager have any mouse events so this must be something in the app messing with it.
choosing an attribute also does a pretty crazy popover flicker.

Lets try to open issues in the MapViewer before opening them here until we know it's an issue with the component itself.
It worked fine with beta 31. And if I only change to beta 33 _and leave everything else as is_ I see the issue. Something must have changed there.
I can reproduce this outside of the map viewer beta with my smartMapping test app.
hidden state - beta 33:

showing state beta 33:

beta 31:

I also see this issue on a panel without a slider.

I would check what mouse events you have on those items and see why they might be causing a rerender
OK, seems to happen only if I'm using <calcite-tooltip-manager> inside the panel. If I comment that out it works fine.
yep! that helps. I see the bug.
Installed
looks good, tested locally with beta.35