Attached is an excerpt from a (piano) score so busy that it is impossible to select a newly created element.
The element in question is the last (horizontal) line, between the staves, near the end of the measure, under the triplet bracket. It was created both in this position and unselected.
I wanted to create a dotted melody line (similar to the previous dotted melody line) between the C natural (staff 2, beat 4, displayed in staff 1) and the following G (staff 2, beat 4+2/3). The C natural is displayed in staff 1 as a performance hint. After control selecting both notes (C natural + G) and double-clicking the line element in the palette, Musescore creates the horizontal line displayed in the attached file. It is created unselected, and therefore impossible to move via keyboard shortcuts.
Not much of a problem - the shadowing tuplet bracket can be temporarily disabled via the inspector. However, it begs the question: does Musescore need functionality to select obscured elements? Graphics programs such as GIMP or Inkscape provide something along these lines.