The x that’s on the upper left hand corner of the Mastery skill? I swear I’ve tried everything but the uninstall button at this point.
check:
ui/skills/classX/classtable.dbr
for invalid entry in:
tabSkillbuttons
Make sure each button points to a valid skill.
Looks like a skill UI with an undefined x,y. Remove it from class table like Kath said
Fixed it, thanks guys.