I personally like to record some material at "sections".
For example let's say that I record from bar 1 to 20, then I stop.
When I am ready, I start the recording from bar 21, but I need to start the playback/record from at least at bar 20 (or 19)....
This causes X3 to do a new lane each time, and .... at the end of the song i get a lot of lanes.... (not so useful).
In the past, with the "rebuild lanes" function it was not a problem, .... but now .... it's for sure a bit complicated.
Anyway I found a "partial" workaround:
1st recording: you get the 1st lane OK.
2nd recording: you get the 2nd lane OK (which overlap a bit with 1st lane).
3rd recording: you are getting a 3rd lane....
Now, as soon as I finish record this, I move the clip to the 1st lane.
I can go on in this way and I will end with a total of 3 lanes (the third one will be always the one that Sonar uses for recording, and I need to always move the last clip in the first or second lane...
For now .... I will try in this way ....
Giorgio