Hi,
I had the same problem with the cumulative RTs, as mentioned at the beginning of this post, with version 2024.1.1.
I just switched to 2024.1.3 and now I don’t get cumulative RTs but negative numbers: -366833.029406667, -366835.804542417, …
OS: macOS 14
PsychoPy version: 2024.1.3
Standard Standalone