Just taking a guess, but are you opening a BiaB song in RB that has only RTs when this issue occurs?
If so check Options-Preferences-Song Generation
Make sure the box for generating Realcharts is unchecked.
This option creates a related MIDI track for any RT that it can.
Otherwise provide more detail on how you are trying it and what you want to happen.

If you just want to open a given RT in RB by itself, simply open a new file, select a track and go to
Generate-Select and generate Realtrack
This lets you generate desired RTs to your hearts content.
If you want to try a bunch of variations try Select Multiriff.

RT = Realtrack
in case of language difference


Last edited by rharv; 01/15/20 01:54 PM.
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.. I do not work here, but the benefits are still awesome