That's how it used to be it couldn't down sample the 24bit wav but they must of fixed it in the 32 bit Biab but not the 64 bit Biab yet.

I just tried importing a 48k 24bit wav into BB32 and BB64 = NO GO
I just tried importing a 48k 128k mp3 into BB32 and BB64 = NO GO
I just tried importing a 48k 16bit wav into BB32 and BB64 = NO GO
I just tried importing a 44.1k 24bit wav into BB32 and BB64 = NO GO

I just tried importing a 44.1k 16bit wav into BB32 and BB64 = GO GO

Using BB 631