Is it possible for the colour label to be modified slightly to allow the indicator for versions, also stacks, to be clearer.
Maybe like my idea shown on attached pics.
I wouldn't mind being able to use a category colour bar option to show masters and versions if that would be easier to do.
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1. You can change the saturation of the label color (Edit > Preferences > File Window: Colors.
2. You can give your version a custom color border (Edit > Preferences > File Relations) to make them stand out better.
3. You can change your label color under Edit > Preferences > Metadata.
Whatever color I choose, somebody will setup a label color which matches the colors used for either the stack or the version icons. There is no "best" solution.