@RobinAnto Ah, thank you for verifying the file that I sent as well as the movie sound import. While it is strange, I’ve seen it happen before on older versions that didn’t have some of the fixes. Honestly at this point I’m not even sure what kind of unique environment you have that could enable such behavior.
One of the devs recently tried to use a 32bit version of the software with Windows 7 and Windows 10 through a virtual machine but they told me it was properly working for them as well
I’ll ask them if they have any recommendation or troubleshooting tip for you but unfortunately your issues appears to be a unique case where your system sound settings could be directly affecting the way this specific software can read sound files.
This can usually be attributed due to missing OS updates or potentially problematic drivers with specific hardware, but that is honestly a bit beyond us since we don’t have direct access to your computer to do a more thorough check, so we can only guess.
For now we’ll keep reviewing this issue, however when you want to preview and add sound to your video at this point I’d recommend using a dedicated video editor instead of using a music player, this way you’ll be able to exactly measure at which frame a certain sound occurs.
There are free video editors available that can help you accomplish this, but you have to be careful looking for those that still work with Windows 7, I’m suggesting this with the additional intent of noticing if there is also a problem with these applications or not that way we may find an alternative to fix this issue, though that’s just a hypothesis.
For now here’s a list of potential tools for you to try out:
Free / Open-Source Video Editors