I'll try testing as many chipsets as I can find tonight using the method you describe. I started a table on the wiki page to organize some test results and threw in a few chipsets that I've got at home (off the top of my head for right now, I'll fill in the details as I test).
Thanks. That will make the tracking of these oddities just that much easier.
And FWIW, I'd like to make a comment here. Mike is really doing all this out of shear "good-will". His work is not being compensated for in any way, and he doesn't work for GGG. While I would love to sell LED-Wiz's all day long, if you are buying them with the the mindset that Mike owes you something because you made the purchase, then I'd rather you didn't buy them.
Mahuti has a decent app that uses the GGG "supported" software for running animations and lighting controls used in games, and it supports RGB control. Multiple device control from the resident app software will also be coming once I get a couple of upcoming new items out of the way. However, chances are that the same few people who have reported difficulties with PowerMAME, will also have problems with both of these solutions. The issue, IMHO, appears to be USB chipset and or driver related. I have 4 systems here and cannot duplicate the reported issues.
So the long and the short of it is this: if the USB subsystem in your computer doesn't like the way the LED-Wiz is being controlled, don't complain to Mike about it. He didn't write the firmware for your USB chip, he didn't write the drivers for it, he didn't develop the communication protocol for the LED-Wiz, nor did he write it's firmware. If it doesn't work, it's not his problem, it's yours and mine. I'll try to lend a hand troubleshooting where I can, but the plain fact is that a few percent of the purchasers will quite possibly either need to send the units back as "incompatible" with their hardware, or drop in a new VIA or other known working chipset based card to join in the fun. Putting pressure on a barely associated third party who is donating his valuable time and talents won't do anything but make them believe the old adage about "no good deed going unpunished."
Thanks for listening.
RandyT