FM13 keeps opening/closing files after distilling

Hello fellows,

I saw this behavior in the past but now it became especially undesired. I'd like Framemaker to close a book w/o saving after PDF distilling is complete. By default, after distilling is finished, FM still keeps munching the book components for a while and becomes unresponsive. Is it possible to avoid this behavior? Am I missing something?

Thanks for your input in advance!