I've long been against the restriction of not being able to sign a player I had released during the same season. In associations where I mirror actual transactions, I always had to go into the "Edit Player" and put him where he needed to go in those cases.
Noticing a "Signing in Progress", I pulled up the signing team's Transactions, which led me to the following:

Is this now allowed, or is Boston "cheating"? [;)]