I am lv 50 as well and noticed that I no longer receive the new codex entries at the top of my screen, I noticed this for sure because I went back to collect datacrons and it does not appear. I found this thread trying to discover if it was intended or a bug as well.

Whats the deference between a Basic Accuracy and the Accuracy for Special Attacks? Special Attacks already have a 100% chance to hit. What attacks are considered Basic and what attacks are considered special?