It is a side effect of changes between 9.0 and 9.5. In version 9.0 you could colour individual components and also groups. When you created a group though, the default setting was 'Same as Parent', which would override settings in individual components, unless 'Color from Children' was selected.
Colour settings were disabled for levels completely, so they behaved like if they were in 'Color from Children' mode. However, the actual mode, saved to the file was 'Same as Parent'.
In version 9.5 we did some re-structuring work and we allowed you to set colour/material on whole level, the same way as with groups. We also changed default mode for levels and groups to be 'Color from Children'. This way if you create a new project in Aspire, it will work the same as in old version, plus you can also change colour setting for the whole level as well. However if you open an old file, all the levels will be using 'Same as Parent'.
As mentioned already by Stuart, the solution is to go to the level properties and switch Appearance settings to 'Color from Children'.
Apologies for the inconvenience.