[s-taylor]

It might be helpful to run the OutlineViewer and attach it to your networkTable and then browse the entries to see where they ended up (sometimes they have an extra or missing level of hierarchy than what you were expecting.
c:\users\<username>\wpilib\tools\OutlineViewer

set the address to roborio-####-frc.local (#### being your team number) and run the client. This will let you snoop on the data and see what's going on. If you see nothing, then it's possible that either your vision processing code isn't writing data, or is even writing it to a different table instance entirely (e.g. to localhost, instead of to the RIO's networkTable instance)

in a pinch, you can just jam data into the table that way and see if your robot code sees it-- that might get you moving on the consumption side while someone debugs the producer side in parallel...