the thing chugs along fine for a few days or a few weeks or a few months and then suddenly won't start up - saying in the browser "Unable to connect" "Firefox can't establish a connection to the server at localhost:25902." IE doesn't help.  I have cold booted to no avail.  All that fixes it is a reinstall which is problematic because I am not using the built-in video so the Catalyst (like gasoline?) POS software has to be installed too and I don't want it......but this fixes the RADXpert.
This one bugged the hell out of me for a long time.  I found very few hints out there.  I can tell you that it's running the Java stuff from here (I suppose the numbers may change?):
C:\Windows\Temp\Jetty_0_0_0_0_25902_Web__amd__8jxwbb
And that when that's not there, things can crater.  Can?  Yeah, sometimes, that folder can be deleted (eg, when clearing the %tmp% folder), and it was just recreated as needed.  Anyway, the ugly news is, I never did find the trigger for recreating those bits.
Uglier news?  I'm on motherboard #4 now, and the system is stabilized.  But I was definitely having very real problems with the first two and that RAID chipset!  (Subsequent boards had memory bus "issues.")  It wasn't just this RAIDXpert issue -- drives would just randomly drop out of the array, forcing me to run in cripple mode while that rebuilt.  Ultimately, when I got a mobo that didn't have that issue, this other problem of the UI going AWOL also disappeared.  I can now remove that Jetty folder, and it's just recreated as needed.
I hate to say it...  With a credit card, they'll cross-ship a new mobo, and you're out the cost of mailing the old one back and a Saturday morning.  Wish I had better suggestions.
Sorry...