I'm glad to see confirmation of the Tyros4 problems...Now maybe since some Yamaha owners have confirmed this instead of saying Chony was in error or had a faulty keyboard...Yamaha can now fix the problem..I find it great when a problem is forth coming and not buried with a closed mind....I would imagine it will be a software problem...but I also feel maybe since Yamaha has an optional ram upgrade..the basic Tyros4 may have a limited internal ram...possibly causing the problems mentioned..
Has anyone with the glitch..installed the extended Ram option?