This 00:00 freeze-up on pause before launching a scheduled recording is a bug/design defect present in the EZ series (2007 and later recorders) and three ES series models from 2005 (those being the DMR-ES10, DMR-ES20 and DMR-ES40).
If one is present when this 00:00 freeze-up occurs press the reset button behind the front panel fold down door. That should allow one to regain control of the recorder within a minute or two. Then power off the recorder so that the recorder might start the scheduled recording.
A possible work-around is to power on the recorder briefly on the same day of the scheduled recording. Of course, this will be of little use if one will not have access to the recorder on the same day as the scheduled recording.
There are other work-arounds for scheduled recordings for EZ series recorders.
1. Use actual dates for scheduled recordings, even if those programs are recurring. Avoid the use of recurring scheduling, e.g., daily, every Tuesday, every Saturday, etc.
2. Ahead of unattended scheduled recordings in the early morning hours after midnight schedule a brief "dummy recording" that bridges midnight, say 11:59 p.m. to 12:01 a.m.