We’ve identified the cause of this issue, and are currently working on a fix, which will be included in an upcoming release of FMOD Studio. Given that we’ve identified the cause of the bug, it’s no longer necessary for you to send us a copy of your project. Thank you for helping us out.
We’ve also discovered this issue does not affect transition timelines with source regions, so you may be able to work around the issue in some cases by adding a short source region to the transition timeline, then removing the resulting fade-in curves from the instrument(s) inside the transition timeline and maximizing the fade-out curves on the transition timeline’s source region.
If that workaround doesn’t work for you, and you’re not able to wait for a new FMOD Studio version that includes the fix, you should be able to avoid the bug by using FMOD Studio versions 1.10.09 and earlier. The bug was introduced in version 1.10.10, so earlier versions are not affected.