N5200 cannot expand RAID to bigger hard drive size

[ataribaby]

Please help. I attempted to increase the storage capacity of my RAID, following instructions on the Thecus site. I put in a 1TB drive to replace a 500GB drive, one at a time, allowing the RAID to rebuild. At the end of that, I clicked "Expand" but it said the volume was full. And yet, the web interface clearly shows that my storage capacity is now twice as large, but my "data capacity" remains what it was before. Also please see the enclosed images. I seem to have radio buttons and check boxes that are grayed out, and I have no options that I can see to change the size of the RAID.

(I tried to post pics put couldnt get it to work. Here is a gallery of the web management screens:

gallery.me.com/abductor#100097

What's wrong here?

[ataribaby]

Trying again with that URL: gallery.me.com/abductor/100097

Note: I also opened a ticket with Thecus. I'll report the result here if they are able to help me before anyone else.