I logged in PFE Bard song and not even animate dead seemed to work for Kelian. The spells would look like they go through but nothing happened. ScottyB even reset the server and couldn't figure it out.
Also my items or potions that buff dont work either......
Have you messed around with overrides at all?
Try to make an exact replica of your PC, and grab me or another DM IG sometime to level him up to test to see at what point (if at all) spells stop working.
This sounds very strange!
K sure I recently created a wizard and his spells worked just fine.