The new skills don't show up in my skillbox .-. I only have Abyss so I'm guessing that's the issue but I could be wrong
Are you using other mods? Some mods use a file called skillinfo.xml
located in: C:\Nexon\Mabinogi\data\db\skill\
That is if you use this file.
Tiara itself doesn't use this file. When it's not updated correctly skills won't appear, or in some cases can cause freeze/hangs/crashes to the desktop when new skills are used.
You may only be using Abyss, but you want to be sure that if that's true that data folder=0 in the abyss.ini, and to rename or remove your "data" folder.