So... quick math says 64 pastes of a "simple progression" and for the sake of argument, lets assume 4 bars to the progression.... equals...according to my calculator, 256 measures or bars pasted in... exceeding by one (1) the maximum number of bars allowed by BB. This assumes no other bars in the song.

Depending on tempo, that's one long song. Most of my songs come in at around 70 to 100 bars depending on the tempo and they're all mostly between 3 to 4 minutes in length.

Got to keep the total bars under 255 in BB. You can make it much much longer in a DAW by pasting it out as far as you want. But that's another thread topic in itself.

As far as tracks not playing properly.... there's a number of different reasons and you need to be more specific about what you're doing to get the results you're getting for us to pin-point the problem.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.