I'm in the same boat, basically anything I do in the new account system ends with
" Error
There was an error processing your request
Return to the homepage."
2 of my accounts expired right when they started this so I was unable to make my next payment, so I'm basically completely down right now, and I still have a few accounts of mine that can't link as well. (I probably have about 15 accounts total, though only 4 were active, most of the others were from around SE launch as I had WAY more free time back then

)
I was out of town during the RTB thing too, so the houses on the accounts that expire are a good 2-3 weeks into decay now, and I believe the new timer is 30 days, so there's a decent chance my castle and brit gate house are going to fall soon. Luckily I have one account that still works so I managed to snag soulstones and anything really expensive from whatever stores in those houses I had already set as co-owner, ...but still...