Same script simultaneously on two FM session/instances

Hi everybody,

I have an issue with a rather big script.

Here is what the script does:

1. it runs over a *.ditamap and rearranges the many *.xml files into a few *.fm files for a new *.book
2. a specifictitlepage.fm is added into the *.book
3. TOC and index are generated and included as well
4. formats and definitions are imported from a specificvariable.fm into to book.

The script works fine until there is more than one FM instance running it, i.e, until I use FrameMaker Publishing Server 2015, which runs a few FM instances simultaneously.

Here is what goes wrong:

1. FM instance 'a' imports titlepage.fm from any other FM instance running
2. the import is not applied on every *.fm file of the book.

Result: the books have the wrong titles pages, sometimes also the wrong footer and colors.

The script is ExtendScript and does not contain any app.ActiveDoc.

During the run, files are generated under \AppData\Local\Temp, could the mix occur due to a dissociation issue with those files?