Hey @Flo, welcome to the forum!
Thanks for the detailed report!
Before we dig deeper, could you try the latest beta and let me know if it still happens there? You can find it here.
If the issue still occurs on the beta, it would be really helpful to get a Log Package — please create it right after reproducing the issue, so the relevant events are still in the logs.
You can create a log package by opening AbleSet’s icon tray, clicking the gear icon, and then selecting “Create Log Package”.
Please make sure to include your project files as well (just the .als files, no audio needed).
To send the files, you can upload them to AbleSet’s support inbox.
I’m looking forward to your reply!