I've probably used some shortkey than hide all objects but the one selected, and then saved blender file and quit. Now, i don't remember what it was and im wasting time to "unhide" them.
The thing is they're not hidden, as ALT+H doesnt work. Tried Clear All Restrict Render but it's even not that, because all objects are: - rendering - visible, selectable IN LIBRARY - do have eye sign toggled on
I just cant unhide them.