Summoners sometimes lose the ability to respec talents

[Aquillion]

As a summoner, I've sometimes noticed the game 'locking in' my recent talent points and refusing to let me respec them, even though I haven't invested any other talent points since then.

I believe that this is related to summoning somehow -- summoning something with higher talents than before or something makes the game think that it's assigning talents, or possessing a monster when its time runs out, or something along those lines -- I'm not totally sure what it is. But it's definitely caused me to enter a state where none of my talent points can be respecced -- I noticed when fighting the Weirding Beast; I realized I needed to respec to do a bit more damage to overcome its healing, but when I went to try, none of my class points, anywhere, could be taken out. Later I observed it happening again when I invested a talent point in the golem, summoned it to see that it was like, then went back to pull the talent points out when I decided I didn't want to keep it for now -- and found I couldn't.

[Aquillion]

Update: I'm pretty sure this happens when you switch to controlling a summon; it considers you to have changed all your talent points or something.

[Timlagor]

Same things happens to Alchemists with Golems.