When I open a file with stretch markers mapped to tempo changes the first stretch marker gets moved.
I've attached a project that shows the bug. Open it with v6.45 and you will see the first stretch marker is at 1.0 stretch (and track lines up with click).
Open the same project with v6.48 and the first marker is changed to 0.97 stretch (and the track is out time with click until the next stretch marker).
Stretch markers at around bar 25, 63, 76 also seem to have wrong stretch values.
(I can't attach the rar of the project file--says I need a security key) Here's a link to rar:
https://www.dropbox.com/s/9n7w6tkdc8...poBug.rar?dl=0