This is a recurring bug which existed months ago and has manifested itself in the game again. Red 5 customer support has said they cannot reproduce it but that doesn't change the fact that it exists.
Finished jobs on the workbenches for the molecular printer will refuse to allow you to claim them denying you any further use of the bench for the play session. The only workaround is to log off the server and relog but this also resets the played time awards for the game significantly diminishing the value of the VIP pass for level capped players as the extra work benches are one of the most valuable features of the VIP pass.