I just upgraded from beta 2 to beta 3.
My "Default post-processing:" is set to +Delete but it didnt happen.
SAB just checked the RARs+PARs (nothing wrong/nothing repaired) and left the files unassembled in the "Temporary Download Folder".
EDIT: In the history tab it just sits there: Status "Verifying..."
EDIT: This bug is reproducible. Happens every time...