@vaporsyndicate,
Have just checked it and for me the result was positive. Notes tab is saving information properly.
See the reference screenshot- http://prntscr.com/gf0bd2
Could you please check your browser’s console for errors (if any) and let me know?
We have this installed on a WP MultiSite install. Is it possible that has something to do with it?
I tested it on 3 different sites and it was broken on all 3 – most recent release of WP and WP ERP installed on all of them. All of them were WP MultiSite installs.