OK, I now have had a more complete explanation (which Ann is posting in the main thread):
For all paying PC Membership previous to Magento, you have seen numerous errors with your PC Membership. We have found a resolution for these issues.
You will see an order for your Membership being charged $1 of store credit that you did not make. This is correct. DAZ issued $1 to your account and made an order for your Membership again for you. Once this has been done, you will no longer see any issues with your PC Membership. If until this has been done to your account, you miss any sales, please let us know, we will take care of that for you.
Thank you for your patience.