The less recent Kontakt version I’ve ever used was 1.1 which yet had not got this issue, so you can be sure that 1.5 does not.
What’s funny is that I’ve bought Kontakt 1.1 and got upgrading to 1.2 and 1.5 for free, than they want me to pay for 1.5.2 upgrade… !!
What’s most annoying is that from 1.2 to 1.5 there wasn’t added anything useful for me (timestretching… blahh… who needs it), while 1.5.2 was far better.