I just changed the thread lengths for each configuration by manually changing the dimension, it seems to work and in my part family configuration table the values followed, does it mean that setting a part family by excel no longer works on sw2015?
No, it's just a bug of the "shaded thread representation" that bugs with the configs + part family....
Already present in the old Solidworks from memory, 2014, 2012, 2010, etc... (see already present before?)
And maybe with 2016.
But the problem can also come from the file, because it was created in an earlier version, then converted, but drags the bug in the file in spite of itself...
And completely redoing screw files, we don't really have the time to do it, or the desire...
in addition to the problem of a different internal file ID, which may be a problem in ASMs...