Thanks, i'll give it a try tomorrow, since i think i am still on v3.0.12. Hopefully this could be the issue.
The link led never flashed. It's just stays on. Or it just stays off, sometimes. When i plug/unplug/replug the J19 several times, the link led is most of the time staying on, but maybe 20% of the times, it stays off.
When launching the jitter monitoring app, i've got nothing but -- everywhere. when i unplug the ribbon, i've got 4095 for min and max and 0 diff. when i plug it on, i've got 0 min, --max and 0 diff.
I'll come back here tomorrow and let you know !