What kind of flash are you using? I just recieved my V4s today. I have a 350D and just put the batteries in, mounted everything and just flashed away. I'm using Canon 550 EX, 430EX and 420EX.I'm sure this probably doen't help much, for more info, try searching "cactus v4", and you'll find 100's of entries that are very helpful.
Mark
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