Just installed 6.51 Build 3159 today, up from 651RC2.
Previously, in Posts, if I R/C and drop to Save to Custom List, and select the only List (named HOLD), NB sends the item(s) to HOLD.
I have mapped the '5' key to "Save to Custom List" and when I hit '5' and up pops the window (Save Posts To....), and I select the only drop down named list.. and it saves.
However, under this release (6.51 Build 3159) a warning pops up, stating, "Add Group Failed: The group name you're attempting to create already exists."
I noticed if I use the menu, POSTS, then to Save Files to Custom List, all are listed as "Dummy", even the one I've set up as HOLD.