Okay, this topic hasn’t been touched on for a while, but since I ran into it just today, I want to share my findings:
In Nuendo 4.3.0 through 5.5.5 (only tested on Mac OS X 10.6.8, but both 32 and 64 bits), the effects of the L/R markers and the Arranger List overlap and need both be considered. (Huh?)
Example: I had a linear project arranged, 152 bars, 3 mins 40. Then I came up with another guitar riff that I recorded at the end of the project with an 8 bar gap in between (just for overview reasons), and because i wanted to splice it in just in the middle and move a part from the middle in front of the outro I created Arranger parts to do just that. For both versions I made Arranger lists for quick comparison.
Now the new version is not 3’ 40 but 4’ 00 because it has 12 more bars. And this is where it gets (sorta) funny.
To create a mixdown of the old version which is exactly 3’ 40 I could just set my L/R markers to match the original arrangement (Arranger List enabled, original arrangement selected). When switching to the new version in the Arranger window, the later-on recorded part was properly spliced in, but at the end the mix output file was cut off 12 bars early. Consequently, I moved the Right marker to 12 bars later (or 20 secs later), and presto! the mix came out fine.
As mentioned before, I haven’t tested this in any Nuendo version on a Windows machine, but I think they’ll behave accordingly.
Be careful to set your L/R markers with enough space in between to fit the length of your arrangement (which you can see in the Arranger window).