Hi,
Something really weird has happened...
I upgraded to Nuendo 7 and suddenly my VIpro gives spikes with only one patch, but a patch i use in almost every project.the Appassionata Sustained Strings.
Empty project, 1 instance of VI when i play more than 5 notes together, Spike !!!
at the same time i can have 30 other instances with other patches, and smooth play.
latency buffer is sufficient at 1024 samples