Simply put; even though your cuepoints have a colour auto-assigned within VDJ, this is not added to the track metadata and therefore when importing the database to MIXO, there's no colour information for MIXO to import!
Instead, users need to manually set colours by right-clicking the track and selecting Edit POI's.
Within this box you can set the colours for each cuepoint. This will then be added to the XML track metadata and when imported to MIXO, will show for each cuepoint.