DSQUERY error, still, after raising domain functional level

After removing the last 2000 DC on the domain and successfully raising the functional level to 2003, I still receive the following error when I try to use the dsquery computer -inactive x command.”dsquery failed: The parameter is incorrect. :Windows could not run this
query because you are connected to a domain that does not support this query.”

I’m trying to use the -inactive switch to aid in AD cleanup of inactive servers and pc’s and was under the impression that this command would work once the domain func level was upgraded to 2003. The DC’s have replicated and all indicate that they are at a 2003 level at both the forest and domain level.

Any ideas?