This is quite possibly a user error.  My priest caster is working fine and I can cast her spells without issue.  When I try and engage with my Wizard, I click his portrait and then have the different spell levels to select.  Once I select a level, the "bar" where the spells appear appears to be minimized - there's no spell name or icon to select.  When playing the priest, I select the level and then see all the available spells.  

 

I am fully rested and I have the Grimoire (sp).

 

Right now, my wizard is simply cannon fodder.  

I've had my guys lock up too. And auto-attack doesn't seem to work/be in the game.

I've had this too. The wizard's spells don't even show up in my current game. Others are fine. Might be an actual bug.

I've only tried the BB Wizard, it's VFX (Visual Effects). Sounds like "Known issue/Missing assets".

Edited August 19, 201411 yr by Osvir

I solved this by actually equipping the spell book.  I now see the spells like I do with the Priest.  I don't know if the Wizard starts out with a book, but I picked one up along the way.  

Likewise, I couldn't cast spells or open up the Grimoire. If it's an item you find, I got no idea where it is, and they should give it to the Wizard right at the start of the beta.