Anyone know if there's a port setting to change in CryptoGlance to get the SP20 info to show up? I'm guessing something is not correct as other manufacturer's machines show up and I've seen screen shots on here of someone having it working.
Have you opened the API port by changing cgminer.conf? if not-
SSH into the SP20, /etc/cgminer.conf, change the W:127.0.0.1 to W:0/0 and you should be all set.