Toolbar Customizations are lost if made in custom workspace with toolbar option
Version 3.2.3 and current 3.3. R.C / Windows 10
1) Custom workspace
2) View / Toolbars / Customize Toolbars
3) Eg: in Playback Controls -> Actions
4) Select "Play" -> move it with arrow up to the top (before "Mid-on" icon) -> Ok
5) Save your score / Quit / Reload
Result: setting is lost. "Play" symbol reverted to its default place.