Closed caption problem

For some strange reason, my To****ba DR550 dvd recorder won't record the
closed captions on both SDTV and HDTV. I have been using many brands of
VCR
and DVD recorders. This is the first time I have such a problem. Does
anyone
know why or additional steps to set it up. Right now when I watch the live
broadcasting thru the dvd recorder, I can see the closed caption. But
after
recording, I can't see it during the playback. It is such a nice dvd
recorder with a shortcoming!