I'm using FreeBSD 8.2 amd64, and phpsysinfo 3.0.13.
I noticed that recently the smart plugin is failing to load, xml.php is not showing any smart info and xml.php?plugin=SMART is coming up as page cannot be displayed.
I then narrowed it down to one device, in my case ada0. When I took it out of the list of devices to run in command mode, it worked fine. I then used it in data mode to see if I could find out what it is having problems with and it seems to be this:
# 2 Conveyance offline Interrupted (host reset) 70% 6261 -