Thoughts:
- On Zenoss 3.1.0, I have had to fully restart the entire Zenoss suite in order to see newly loaded MIBs result in properly translated OIDs.
- Check for MIB compiled dependencies on your desktop machine, using something like BlackOwl MIB browser (http://sourceforge.net/projects/blackowl/)
- On 3.1.0, I always do "zenmib run <mibfile>" from the command line in the /usr/local/zenoss/common/share/mibs/ directory where I copied the MIB files. (Did you do this?)