OK, by now i'm really fed up with this: quite a few Realtracks cannot work with beat count changes within a song file ...
OLD REALTRACK BUGS THAT NEVER HAVE BEEN FIXED:
see 2 quoted posts i made below, of many others i sent in over the years; one FROM way back in 2011:
Originally Posted By: fiddler2007
(subject:track rendering errors versus chord position ....) With BIAB 2011 and the first bar set to 2/4 i keep getting chord rendering errors: after a few bars the rendered track chord change comes a bar too late, re-rendering does not change this ......

and a post from 2012/2013:
Originally Posted By: fiddler2007
Hi Supporters. After upgrading Biab from 2012 to 2013 audio edition, an old Biab bug still keeps pestering on; i complained before about it, and it still makes using the program pretty useless for my goal as tryout platform and sending out demos toward hired musicians before recording stuff for real. I really wonder if your beta testers can't do any better before a release.

THE BUG described AGAIN: If you switch to 2/4 for one bar i bar-settings, and back to 4/4 the next one, the realtrack generated happily keeps it's 4/4 counting totally ignoring the inserted bar-setting switchings, and is as such 2 beats late after that definitely. For me this is a major bug and pretty annoying, i did not use 2012 for demo building for that reason very much. Annoying yes, also regarding all the money i spent on Biab since them ole Atari days. -F.

PS i used RT130, fiddle shuffle.

I posted many more similar 'complaints' since, and sent many frozen tracks with added information to support@pgmusic.com over the years, and never had replies which solved these issues; though some staff members occasionally replied, even Peter in 2013. There have apparently been no downloadable fixes with RT updates so far, and my guess must be then that they cannot, or don't want to fix matters at PG LoL .... these fixes could be very welcome, AND I DON'T NEED ANY VIDEOTRACKS, just a working BIAB doing the jobs i want it to do without annoying old bugs.

If anybody wants to experiment: some RTs i use for generating backing tracks that mal-function are: 593,594,595,596, 428,429,430, in this case for me all useful fiddle stuff ......... And MANY more RTs behave in the same way. F