Since v2.3 I am no longer able to change the lead-in time. I can type a value in the field, but whenever I press apply it will reset to the default lead-in time.
I tried it both on Mac an windows with the same result, so it should be a platform independent issue. When I hover with the mouse over the field, the cursor also rapidly switches between the arrow and text form.
The only way to get around this at the moment is to manually edit the config file, but that value also resets to the standard again every few restarts (or when I change other settings related to the vinyl mode.
This renders the absolute mode for Serato cds unusable, as there seems to be an offset with the cd you're able to download from the Serato website. Not sure if this is another bug or a systemic error of the positional information, as it behaves the same across all my machines, also independent of the medium I'm playing the timecode from. Even virtual dj hast the same (about 0.5s) offset.
This happens also on Ubuntu Bionic