You may want to open a support ticket on this, but here's a few things to look at:
1 - screenshot - where is this happening?
2 - Live view of servers or components
3 - Local ConfigObject (in a template) or on Servers
4 - If it's set for servers and not local to a template, look in the 'Tools | Config Object Dictionary' and see if you have permissions on the /etc/vfstab object, and screenshot the config of that object
4 - If it's local to a template, screenshot the local config object config
Thanks Bill. I realize that just because a configuration
file exists in a "Live View", that doesn't mean the
Configuration Object Dictionary knows about it.
Once I defined /etc/vfstab in the Configuration Object
Dictionary, I was able see it in my custom template.