I've had Power Tracks and forte since 2005, and have had no problems with midi until RealBand.

Using BritFolk even 16 style, I typed a 20 bar repeating sequence of C, Am F, G7 into the chords window.Then I clicked on the RealBand "BB" button, and the program auto generated Midi Bass, Piano, Elect Guitar, and acoustic guitar (along with Real Drums).

Looking at the event list, I see no control messages, only notes.
Using your help, I added a control message at the start of each track. The control message specifies the GM patch number.

Still no sound, unless I "mouse around" while the file is playing - such as selecting just the GS wavetable synth with no Dxi, and then selecting the default dxi synth (either Coyote or Forte). Sometimes this action produces sound until the file finishes playing - but when I re-start - no Midi sound.