There is another glitch that often occurs that I just forget about mentioning.
In battle whatever it is that causes you to be able to activate the Soulmancer's spell happens towards the end of a regular attack. Then the options for the Soulmancer's spells appear with your next regular attack over them. The only way to activate the Soulmancer's spell is to choose the regular attack then quickly choose the Soulmancer's attack so both happen at the same time.
But once you do this, you can no longer see the icon above the Soulmancer's head that tells you how to activate her (?) magic.
If this makes no sense, I will try to make screenshots of it next time it happens.