I just checked that style and it behaves normally here in RB. In fact, it's the Song Setting for RD that counts - if that's disabled, doesn't matter if the PREF setting is enabled, a generation will produce the midi drums.
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I disabled RD in both the Song and Prefs. The interesting thing is that the BB song imports the MIDI drums, then the import process continues and generates a RD track and ERASES the MIDI drum track right before my eyes. Then, when I go back to check Prefs and Song Settings, RD is back to being enabled.

Ah. By "import," you mean you are opening the mgu (or sgu) file in RB, right? But I'm not clear whether you are actually regenerating it. The mgu may contain a parameter that translates to the the RD enabling that you see. So after you've opened it and it's done whatever it does, make sure that Song setting for RD is disabled and hit that little "+" button next to "generate." Doesn't that give you the midi drum track? If not, then yeah, this is weird. Only other thing I can think is to reset to factory. You do that by removing certain files. I don't remember which, so won't guess, but a search here will find them.

BTW, if you mean to imply that you want to *preserve* the tracks as they last played in BB - ie. you don't want to regenerate in RB - then save the mgu file as midi and import that into RB. (In RB, a midi import is technically an "open" of a .mid file - same dialog as for opening a BB file.)

Good luck, Ron