geometry dissapears after re-opening file in maya

Im working on a project in maya whereby ive created some 3d text using the text tool then used bevel plus to turn the curves into geometry. I also have other geometry in the scene but when i save and then re-open the file the geometry created from the text curves never remains. After the geometry has been created with the curves i delete the curves themselves, is that my issue? Any advice or comments would be helpfull, thanks

im working with maya 5.0