I am using QGIS 2.18.26.
I have problems with a layer disappearing on map in my composer. First I thought it is a scale based visibility problem, it is a layer with some rectangles and titles on them on a map, visibility is setup to maximum 9 000 000 and minimum 55 000. Playing around with the scale based visibility made the layer appear sometimes but not in any logical way. Then I noticed that clicking of the scale based visibility setting does not seem to help, the layer is still hidden.
The rectangles does not show up. Never when generating an export / pdf / atlas, sometimes though but not often on the print composer screen before generating.
I have tried many different settings, and cannot see any logics in when the layer is shown and when it is not.
Does this ring any bells, any similar situations which have found a solution?
The layer is a locally stored shape layer with rectangles, 12 of them, covering the whole map (rectangles that show the atlas pages on a minimap on the side of each atlas page/big map). The layer is using the same projection as all other layers in the project. AND the rectangles sometimes appear, only to disappear a bit later. The rectangles / the layer in question can be seen in qqis main view as this: imgur.com/3GrMKzK . But in the print composer, no rectangle layer shown: imgur.com/Z1f05fC . No scaled based visibility check-marked now.