Yes - have used it and have had same issue. usually with that error you are not providing the full and/or correct moniker info, e.g. wrong dms name, wrong object id. I used fiddler to view the info being passed to/fro on the base worksite web product to see how they format those same IDs which helped alot. I hope this helps.
WWest
2010-03-26 18:53:47