I have been working with Fabrication 2018 for over a month now and within the past week I have noticed that at random times anything that was marked as "exclude from fill" will no longer be marked as such.  I have also noticed that when i use the grips to extend a piece of duct it will not always work.  Sometimes it tries to add in fire damper sleeves rather than a piece of straight (fire damper sleeves are marked as exclude from fill).  Has anyone else had this problem or know how to fix it?