Hi ,

Reaper version is 6.57 , but the problem exists also with another daw (Vsthost) , on two computers running Windows 11
(maybe this OS is more tricky about certain errors ?) ,and it can happen at the FIRST generation too.

Syncing the tempo before generating song does not help

I have checked disk space on both computers , it is OK

I have taken care to restart the computer before testing (but not always)

I am using the BIAB plugin as it permits to generate songs then play them without putting them on tracks (by just hiting the "play" button") , and I am using Reaperfor the jamtaba plugin (playing guitar on the internet live with an backing track fed directly by the BIAB plugin)

Anyway , let the developers investigate.