mt refuses to report location on the tape

[Mindy Preston]

I have a RHEL WS 4 Update 1 machine with a DLT drive attached.  A user 
wants to use it, but is encountering some weird behavior from mt.

The device shows up in dmesg, the module is loaded, and /dev/st0 and 
/dev/nst0 exist.  tar -tvf will successfully list the contents of a tape 
in the drive.  However, 'mt -f /dev/nst0 tell' fails with 'no such 
device'.  Normally I would suspect that the tape drive doesn't have this 
capability, but this command worked just fine with the machine's former 
Redhat 7.2 install.  mt's other functions, including rewind, etc. appear 
to be working fine.

Any ideas?

-Mindy