Some bugs have been found while reworking Material Editor: ### When a different material shall be chosen for a particle, BornAgain crashes Before the crash, this dialog appears: . Then the application exits. This has been introduced at some point since the last release (not present in BornAgain version 1.18) *** ### When removing an already used material, BornAgain crashes In the material editor, a material can be removed despite it is used in a particle. Later, when running the simulation, BornAgain crashes. On other occasions errors occur (e.g. when showing the 3D view - "material not found") expected: material can't be removed, a hint is shown BornAgain version 1.18 *** ### When the color selection dialog is canceled, the original color is lost expected: the color stays the same as before BornAgain version 1.18 *** ### Wrong tooltip on **color** selection button:  expected: "Choose color" or similar BornAgain version 1.18 *** ### After adding or cloning a material, the new one is not selected expected: it should be selected for a better workflow. BornAgain version 1.18