Does it do the same thing with any other spell?.. or JUST Feat like Cat?
You are saying, the spell cast window where you load the spells to cast is buged?.. but buff windows is not .. correct? If so, have you tried another spell cast window? Does this happen in every spell slot in the spell cast window 1-10?.. or just one?
This happens with all UI's even Default?... so you /loadskin and chose Default and Feet like Cast spell in the spell cast window is not showing up?