That's odd, I went to You are not allowed to view links.
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Login, and it indicated that the newest version is 2.1.1.0. My desktop PC has 2.1.4.0 on it, which I downloaded last December to experiment with before I even got my first Express kit, and my old laptop which will be used for my actual Christmas display has 2.5.0.8.
Did vixenlights.com realize that 2.5 was "Vixen Vista" so they reverted back to an older version which was more stable?
Either way, I don't think I'll be using the light curves with my LEDs. Sure, doing a slow fade over 5 seconds or so doesn't look right, but if I do a fade over 1 second, it looks fine. I even hooked up all my different brands, types, and colors of LEDs on one channel and to see how it looks... the fades aren't spot on, but I'll live with it.
It's quite possible that there is nothing I can do about the sudden brightness drop-off when going from 1% to 0% because of the way some of the LEDs in the strings are. I guess some models of LEDs are inherently less energy efficient, because on some of my LED sets, the 1% brightness setting looks like 1% on my incandescent set.
Experimenting the fades yesterday, I realized how stepped and choppy fades were at 100 ms event lengths. 50 ms was an improvement, but still some choppiness. Turning it down to 25 ms (yikes!) made it look acceptable. 25 ms is 40 frames per second, so I may change it to 30 or 33 ms (about 30 fps). It would be nice if the Express didn't only have light curves to smooth out fades, but also had something to allow an LED light string to emulate an incandescent bulb's slower light response times. But I may be dreaming.