[R] problem with bagging

[Alexander Sirotkin [at Yahoo]]

I'm having the most weird problem with bagging
function.
For some unknown reason it does not improve the
classification (compared to rpart), but instead gives
much worse results !

Running rpart on my data gives error rate of about 0.3
and bagging, instead of improving this results, gives
error rate of 0.9 !!! 

I'm running both rpart and bagging with exactly the
same parameters, I even tried to run bagging() with
nbagg=1, which should be identical to rpart, but still
- bagging gives this terrible error rate.

Any help would be appriciated.