bitflipper
FWIW, 5.6.1 isn't giving me any trouble here. But then I have no old projects.

upgraded to K 5.6.1 and it did not give any troubles when tested on that one particular project. so I'll stick to it for the time being ...

Just installed Native Access at the Desk. Opened it to set the preferences and realized that I can only set one Content Location. 
What do people do that have Multiple sample drives with Kontakt libraries installed on different drives?  Read the NI FAQ and it says that you just need to get a larger single sample drive... It also said that Native Access is only for Komplete 10-11 users currently... 
 
Looks like it's time for a call to NI (we'll see how that works out)