My friend recently upgraded his Native Instruments Guitar Rig from 4 to 5. He is using Cubase 6 everything is 64 bit. He loads the GR5 as a VST plugin on an audio track for his guitar. Every time he tries to load one of the new GR5 presets both the performance meter in Cubase and the CPU meter in GR5 start to fluctuate and jump rapidly and the audio begins to break up and "crackle". His GR4 version always worked perfectly with Cubase 6 with no issues ever. It looks to me like it is only the new GR5 presets he selects that does this. He is very upset at upgrading now and I feel responsible for suggesting he buy the upgrade. So I would like to ask for help from anyone out there who might have a clue or uses Cubase 6 with GR5 and has either had this problem or has some idea on how to fix this. NI has of course no idea and has been no help to him.