I've been seeing the same thing. I tried reinstalling BM2 and Dropbox, but that didn't fix the problem. Started seeing it around the time I updated to iOS 7.1.1 on iPad Air.
Just bought beatmaker 2 and I'm having this issue too, any solutions? Most of the samples organised into folders on my Dropbox aren't being seen in beatmaker 2. All other apps it's fine. Cheers Tom
And are you browsing with the right device...if you are browsing for patches for instance, you won't see samples with bm2's file structure. Bm2 only recognizes the files it is looking for ...for example... Song browsing only sees songs, sample browsing only sees samples, and patch browsing only sees patches
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Cheers
Tom
Are some of these folders "shared folders" ?