Start a new project.
Create a track.
Set the time selection to cover the first four bars.
Insert an empty item.
Ctrl, click, drag, drop the copy right after the original.
Glue.
Loop to beyond bar 16.
Check the loop at bar 16 and zoom in.
Loop is out of sync.
Also see this thread.
http://forum.cockos.com/project.php?...3881#note16537