I insert the VSTi or VST3i into Reaper
I load a style successfully
I enter some chords
I generate the tracks successfully
I click Select and then choose "Select a Multiriff..."
I choose a RealTrack for the multiriff and click OK
Nothing appears to happen...
I click Custom...and click All Riffs under Multi Riff Generation
Nothing ever happens...

This has worked (not worked) that way in any version I have tried including the latest 607. And it doesn't work in the stand-alone nor the VST.