From what I've understood with the Saber blade trails and colors is, there's a set amount of colors in the palette that has an associated blade trail. Each Lightsaber has a palette like anything else, and that palette by default actually has more colors than what is provided by crystals in the game.
Now there's a number of colors seen in the game that has the trail associated with it, but if you switch it to a color that isn't normally in the game (such as Silver/white) it lacks that trail color, and it uses the thick default red instead. You might already understand it that by default weapon trails are the 'red ribbons' seen on anything else, this is likely the Lightsaber using the red ribbon instead of it's specialized trail.
If Lasko's tre files did any changes to the palette it may have broken the association of the color and the trail, but I can't say for certain. Logically, if you were to replace the color of a default color that has it's own trail, you'd expect it to keep that trail.
I'm using the TRE files also. I will check to see if the problem is happening on my end as well.
