I did Nothing special,i just opened different songs and clicked…somewhere.I made a small video,that says more than thousand words.BUT:its hard to reproduce,the bug disappears in one song but shows up in another instead.But happens quite often,it shouldnt hard to find.
As for the shifting timing of Audiofiles:it happens often in a little bigger projects but i have currently not time to track it down.Probably i can make a demo/video when i`m back again next week.
AND another new bug:The 1.7 updates whiped all the instruments"Attack/Release"values in my songs and set them to default again 
Midi Port fail.zip (1.74 MB)