You should not use ArcSDE command-line tools on tables registered with ArcGIS -- All you'll do
is corrupt the ArcGIS registry (which will cause the very problem you're describing). If a table
has been registered with ArcGIS, it should be deleted by ArcGIS. If you've already deleted it,
you need to recreate it (just an object with the same name, not the exact contents), and then
use ArcGIS to delete it properly. If the delete hangs, contact Tech Support for assistance.
- V