I stumbled upon what seems to be a nasty bug in OC.
My character is Bard 4/Fighter 1, just got enough experience to level her up to level 6.
I wanted to give her "curse song", but it doesn't appear on the list of seletable feats.
I exported the character and startet MoTB to see if it workd there and I can select the feat there.
What's wrong?

Does you character meet the prerequisite? You need at least 3 Perform to make it available. What more you can't select if you level up in a class other than Bard. So when you want to level as a warrior, the feat won't be on the list. In your case you also need to wait for level 6, as this is the point where a non-warrior classes receive new feats.

Check me if I'm wrong, but that is character level six, not just "Bard 6". A Bard 4/Fighter 1 has 5 character levels, so they'll get a feat for being level 6 if their next level is a Bard level, and they'll have two feats to select if their next level is a Fighter level (one for hitting level 6, one for reaching Fighter-2).

You're right. :) But he won't get the feat unless he levels up as a Bard. This is a class feat and it's unavailable if the player decides to level up in a different class.

Ok, I re-loaded and it works now.
Thanks for help.

If you have the answer to your problem, then please mark the relevant post as the solution. That way others can see your question has been answered.

How do I mark this as solved? Somehow I don't see a button.