I was able to render short 12 bar song in ableton. render time was long but it worked. i was able to regenerate a single, separate track with no issue. multi riff caused range error but I was able to click through that and render completely although render time for 8 bars was over 12 minutes. ( Now i know why they skip ahead in video). tried to re gen one of the multis and it tried to do them all and crashed ableton completely causing need for full reboot of computer.

Maybe 610 will be the one?