Problem with saving plugin configuration

I have a problem with the project saving.

Y create a project, with a midi track. Y atach to this track a plugin P.E fluidsynt. Next y load a Soundfont in the plugin, and chose a sound in the bank.

When y save the project and later i load the same project, all the configuration is correct except that the sound chosen in de bank is the first it appears (if de sound bank is GM the sound is the piano).
It's a bug or i'm doing something wrong?.

Thanks in advance.