Sorry for the confusion Eric over these check boxes, I myself got confused a bit as when I looked again at the 612 I saw these as well, however this was because the page was loaded from the Firefox cache
once I cleared the cache they do not appear in the 612 page.
Now the 612 has been working well since I swapped it back in last night, and yes I can see Bitswap: 20952 140 in the telnet data so it is swapping. So considering the issues with the 610 then I think I will flash it with the 612 firmware and then try again.
Stuart