Device collection unavailable for deployment

[fj40ratt]

I seem to be running into this more often as of late.  I've created a basic OSD task sequence but when I attempt to deploy it the collection I wish to direct it to, it does not appear in my list.  I know it is there because I have deployed other OSD task sequences to the same collection previously without issue and I can see the collection.  I also run into this when I create a new device collection and try to deploy an existing TS to it.  Thoughts?  Thanks.