apple never respond
common factor ,it ocurrs when i have a lot of plugin
it does not affect to playback ,but if i make a change it is random and maybe i cant return to the original
i mean, if i have 4/&%..and the playback performs ,4/4.if i try to change this to ..4/5 it can change to anything like 4/32 or whatever
so,only if i dont change nothig it playback perfect.
how can i trash the preference or move them?
thanks for your cocern