Hi Stuart,

They do use their own temporary folders with their unique names, so it shouldn't be an issue.

We would need to confirm whether the multiple instances are really the problem. If you set the maximum alambic instances to 1, does it fixes the issue? (you can change this in the Preferences, under Messenger)

If not, then it's probably something else, such as an external resource being locked by another program at the time the job was trying to run.

Regards,
Raphaël Lalonde Lefebvre