Well, on my first test the mgu opened in RB here and the Realdrums were present and in time ..
Opening your posted SEQ file resulted in a mess in RB, no Realdrums as you described. Your SEQ file seems bad.

However; when I opened your same MGU file in RB, let it regenerate, then saved it as a new SEQ file things seemed to be back as expected.
Hope that helps ..
Not sure where your error occurred, but here if I open your mgu file and save as SEQ file, then play that file, things seem to be OK.


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