Base File Friday 1-3:30 PM. Ran DPOS Saturday at 10 AM. Processing screen stayed around 45%. 2 hours later the report said "no CORS in range". Tried the same file again Saturday at 2 pm. Same result, 45% by 3. Checked at 3:15 pm and the report saind "No CORS in range". Base site was all sky. Prior to starting base I collected a check Mass Cors Rtn shot that checked 0.02'. Is this a Massachusetts problem or a DPOS issue? Typically I can get a DPOS solution hours after the session, while a few closer MA CORS stations may come in after this for a slightly refined solution.