Cosmetic problem when importing playlists

Hi - import of playlist has some cosmetic problems. I am trying (again, now that 4.1.1 is out) to migrate from winamp to SB. So I create a smart playlist in winamp for each rating, export each as a playlist, and then import the playlists into SB. When I try to rename the PL in SB, I type the new name & hit return, in some cases the change is reflected, but often the change does not "take". However, if I quit & reload SB, the change is reflected there. This is windows XP SP3.