Guys, Here's now to diagnose this.
release:prepare: a) runs an ordinary build which should succeed. b) edits the poms to remove the -SNAPSHOTS. c) checks them in. d) makes a tag. e) puts the new snapshots in the poms. f) checks them in. I don't see a tag. So I don't understand how you got to be building with non-SNAPSHOT dependency. I recommend reverting everything and trying again, or recruiting me. I could take this up this evening my time.