I have had no issue, even on KL flights from the UK to AMS on my way to and from PDX. The only thing I have found is the KL CSA needs to add a zero before my MP number to get the system to recognize my MVP/G status, then it prints out the sky priority on the BP.

I have an old Mp number and it started with a zero for years. For he last several years the card number is the same except no zero at the beginning.