I put in a 500GB hard drive just for the Open-E OS
the computer has 3x 1TB drives working in a s/w RAID5 array, giving 1.8TB

soon as I registered the key, everything in the Web GUI is locked down, saying its exceeded the max storage capacity.

I don't understand this, the 500gb HDD doesn't even show up in the web GUI

Why is this happening? and is there a way around it.