Found very interesting article related why the beatgrids and cues/loops might not match …
So, the probelm might not be that our tools are working incorrectly.
When we are using different tools we are editing mp tags resulting incorrect data into them.
=> Tools doesn’t know how to handle the incorrect data.
And the actual root cause might be the encoder sw entering incorrect data to files.
So remember this when moving data using new OneLibrary.
The article talks of 6% of the files beeing offseted by 26 ms.
A terrible quality control 
10000 files > 600 “not correct” files. its going to be lot of work … and surprises.
And no way to detect which file is badly transfered by the OneLibrary.
i tested it before reading all this, and the first cue of the first track I played in djay was a loop and it was wroooong, hahaha.
hahaha!
I thought i was alone. For years I fought with encoder shifts - they actually worse with MP4’s - i think a much larger % of tracks have shifted cues n loops. Dealing with a shifted cue is easy because sync can take care of it, but a shifted loop can’t be used whatsoever! You have to delete and redo afresh
I handle my track prep in serato (inputting cues and loops), then djay reads those. Most of the time they’re not shifted though when you meet that one track with a shifted cue/loop, it’s so annoying.
