The color of the tracks depends on the number of days passed from the date of the first (or marked) event to the current date.
- Tracks with "age" up to 15 days - are not highlighted by color
- From 16 to 25 days have passed - green
- From 26 to 40 days have passed - yellow
- More then 40 days have passed - RED, it's time to think about a dispute on PayPal or case on eBay.
For the correct caunting the dayse from the moment of payment, you should add an custom event with a payment date.