Hi Blake, thanks for reply.

The green progress bar appear already full at 100% (no previous filling on display) and stuck there. My file activity monitor (Filemon) show a infinite loop as I describe in my post.

However the instrument notation is rendered well and I get the final video well rendered, as long as videos of the performing instrument are not included, only notation, otherwise it gets stuck.

Even after update to 506, actually the issue still happening with all realtrack video styles, such as:

Style is _GOGETER.STY (Go Get 'Er Hustling Jazz Shuffle)
Style is _BIGRIG.STY (Big Rig Train-Beat Country)
Style is _HOTCLUB.STY (Hot Club Gypsy Jazz w Solo)
and more.

Oneil