It's most likely not a problem with your system.
1) Be sure the gradients are activated
2) Go to single player
3) Type in ''/dl Sunny'' (without the quotes)
4) After it says "Download Complete" in the chatlines, type in "/lp 0 Sunny" (without the quotes)
5) If you don't want to do steps 2-4, you can just play a few matches in multiplayer to download your items automatically.
*Either way, your gradients should show up after completing these steps.
#sunny 452514
TEXT 0;0 0 0 0 0 0
ITEM 0;44 33 0 33 47 33 0 34 0 0 0 34 0 34 47 0 0 0
BODCOL 0;0 0 1 35 2 35 3 0 4 0 5 35 6 0 7 0 8 35 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0
GRADCOL1 0;0 40 1 40 2 40 3 40 4 40 5 40 6 40 7 40 8 40 9 40 10 40 11 40 12 40 13 40 14 40 15 40 16 40 17 40 18 40 19 40 20 40
GRADCOL2 0;0 28 1 28 2 28 3 28 4 28 5 28 6 28 7 28 8 28 9 28 10 28 11 28 12 28 13 28 14 28 15 28 16 28 17 28 18 28 19 28 20 28
FORCOL 0;0 33 1 33 2 33 3 33 4 33 5 33 6 33 7 33 8 33 9 33 10 33 11 33 12 33 13 33 14 33 15 33 16 33 17 33 18 33 19 33 20 0
RELCOL 0;0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0
REPCOL 0;0 33 1 33 2 33 3 33 4 33 5 33 6 33 7 33 8 33 9 33 10 33 11 33 12 33 13 33 14 33 15 33 16 33 17 33 18 33 19 33 20 0
BELTNAME 0;
TRAILCOL 0;0 92 1 92 2 92 3 92
TEXBODY 0; 0 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
BMAPBODY 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
TEXJOINT 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
BMAPJOINT 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
TEXTRAIL 0; 0 0 0 0
TEXGROUND 0; 0
FLAME0 0; 0 100 90 0 1 0 30 200 255 0 10 120 255 255 0 0 0 42 0 0 30 15 16 0 50 0 0 0 0 0 0 0 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FLAME1 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FLAME2 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FLAME3 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
FLAME4 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
I recommend using the stable 3.9 version.
Anyway, if you replace the contents of your item.dat with the following code, it should be ok.
#sunny 452514 TEXT 0;0 0 0 0 0 0 ITEM 0;44 33 0 33 47 33 0 34 0 0 0 34 0 34 47 0 0 0 BODCOL 0;0 0 1 35 2 35 3 0 4 0 5 35 6 0 7 0 8 35 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0 GRADCOL1 0;0 40 1 40 2 40 3 40 4 40 5 40 6 40 7 40 8 40 9 40 10 40 11 40 12 40 13 40 14 40 15 40 16 40 17 40 18 40 19 40 20 40 GRADCOL2 0;0 28 1 28 2 28 3 28 4 28 5 28 6 28 7 28 8 28 9 28 10 28 11 28 12 28 13 28 14 28 15 28 16 28 17 28 18 28 19 28 20 28 FORCOL 0;0 33 1 33 2 33 3 33 4 33 5 33 6 33 7 33 8 33 9 33 10 33 11 33 12 33 13 33 14 33 15 33 16 33 17 33 18 33 19 33 20 0 RELCOL 0;0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0 REPCOL 0;0 33 1 33 2 33 3 33 4 33 5 33 6 33 7 33 8 33 9 33 10 33 11 33 12 33 13 33 14 33 15 33 16 33 17 33 18 33 19 33 20 0 BELTNAME 0; TRAILCOL 0;0 92 1 92 2 92 3 92 TEXBODY 0; 0 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 BMAPBODY 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 TEXJOINT 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 BMAPJOINT 0; 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 TEXTRAIL 0; 0 0 0 0 TEXGROUND 0; 0 FLAME0 0; 0 100 90 0 1 0 30 200 255 0 10 120 255 255 0 0 0 42 0 0 30 15 16 0 50 0 0 0 0 0 0 0 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FLAME1 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FLAME2 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FLAME3 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 FLAME4 0; 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
If you used to have textures make sure you've deleted the texture files in custom.
Right. Have you tried deleting the entire custom folder and then play a game or two online? I really can't understand how this isn't working, the only solution I can think of is deleting it, as I suspect the folder might be set to read-only or something that has the same effect.