Ok below is a packet capture from Vixen 2.1.10 to the Etherdongle: I was running the attached sequence which is 2048 channels of which I have 16 set up randomly flashing. My Lynx Express picked up the data and flashed it 16 led's in the random pattern. I am running this on my show computer (Windows XP - Athalon XP 1800+ 768GB Ram) to a NetGear FS105 fast switch (which the ED is connected to) which is connected to a Net Gear RT311 router which is multicast capable. If you PM me I will give you the complete wireshark capture and the vixen file if you want them.
Some notes in setting up Vixen with the ED, make sure the ED is plugged in and connected before opening Vixen and setting up the the output plugin in your profile. It should look like this:

0000 01 00 5e 7f 00 01 00 a0 cc 3b 36 a7 08 00 45 00 ..^..... .;6...E.
0010 02 9a c3 30 00 00 01 11 41 b0 c0 a8 01 ca ef ff ...0.... A.......
0020 00 01 08 1c 15 c0 02 86 1d 2a 00 10 00 00 41 53 ........ .*....AS
0030 43 2d 45 31 2e 31 37 00 00 00 72 6e 00 00 00 04 C-E1.17. ..rn....
0040 31 20 4f 5c 2b a9 0f 48 9c 02 fe dd f2 dd b1 e7 1 O\+..H ........
0050 72 58 00 00 00 02 50 49 58 45 4c 4e 45 54 00 45 rX....PI XELNET.E
0060 54 48 45 52 44 4f 4e 47 4c 45 00 00 00 00 00 00 THERDONG LE......
0070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0080 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0090 00 00 00 00 00 00 64 00 00 00 00 00 01 72 0b 02 ......d. .....r..
00a0 a1 00 00 00 01 02 01 00 00 a6 00 00 d0 00 d4 00 ........ ........
00b0 67 00 49 c9 00 bf e2 00 00 00 00 00 00 00 00 00 g.I..... ........
00c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
00d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
00e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
00f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0130 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0140 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0150 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0160 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0170 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0180 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0190 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
01f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0200 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0210 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0220 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0230 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0240 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0250 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0260 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0270 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0280 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
0290 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........
02a0 00 00 00 00 00 00 00 00