This is very important to know and understand and in different manuals people say different.
I have found that when you plot by gpu several files starting nonce of next file is starting once of last file + nonces plotted:
Starting nonce nonces sttager
file 1 0 10171504 22064
file 2 10171504 10171504 22064
file 3 20343008 10171504 22064
Is with Xplotter different? Do you need add +1 no next file? like 10171505 from example?