When working in a project for 3+ days with Kontakt 7 loaded quite large libraries (Shreddage 3.5 in my case), UI becomes unresponsive. DAW's plugin wrapper UI works, tho.
Also playback is working. Automation and MIDI notes are working. But UI is frozen.
Additionally, loading new instances of Kontakt 7 don't solve the issue. UI is frozen in the new instances as well.