flex time not working properly since update 10.4
Does anyone know why in 10.4 and 10.41 update, when you use flex time on a track it completely screws up the timing even without you changing tempo on the session? I've looked at other threads but can't get it working. All I want to do is speed up the session and the audio follow but Logic now seems incapable of that!
Any insight gratefully appreciated
Logic Pro X, macOS Sierra (10.12.6)