Hi,?
I know this thread is somewhat old, but I had exactly the same experience yesterday and managed to recover from it.
I checked both the original POWER input tape as well as the newly created blank tape as both were empty except for two tapemarks on each tape. This was in fact my second attempt to run this job.
I downloaded the POWER input tape again and re-created the blank tape and re-ran the job. On this second (now third) attempt it ran successfully.
My conclusion is; there is nothing wrong with neither the POWER tape nor the DOS/360 utilities. You just have to be very careful when re-running jobs.
Regards,
Steen