I will try to post this in English to reach a wider variety of players. As English is not my native language please try to ignore mistakes.

I am actually adressing other players in this thread, not a GM. I already talked to one ingame, we couldn't find the mistake. But maybe someone else knows the problems or can point out what we forgot to check.

I want to swap a feat with Fred's help.
The Character in Question is a lvl9 Artificer and lvl1 Warrior. I got myself the needed Dragonshard, I do have the money to pay him.
When I talk to Fred the first problem occurring is him showing me only the last two acquired feats, not the older ones. Which is weird, because as far as I know one can swap them aswell.
The older one I want to swap is of less importancy, so I ignore that for the moment and try to swap the feat I took by mistake. (Manyshot just isn't that usefull for an Artificer)
I can move it into the "old feat" slot and get a (really, really) short "please wait" on the right side. Then: nothing. No feats are shown as possibilities. I had the freedom to choose when I took it, so I should have other options right now. But nothing there.
Therefore I cannot swap my feats. Neither the older ones, nor the new ones.

Did that occur to someone else? Does someone maybe have a solution for that?