Quick question re Artist format to renderer

[simoncn]

In this case, I can't think of any reason why the separate ARTIST tags would not be combined into a single comma-separated value for sending to the control point.

Another possibility is that the player is reading the ARTIST tags directly from the streamed file rather than using the artist value sent to the control point by MinimServer. Can you try a different control point such as Linn Kinsky or BubbleUPnP to check this?