After my last save I get this weird warning dialog when I load my esp in the CK:
It seemt to be referring to a string, "Where is your " but I have no idea where it is or why it has an extra space. The warning isn't very helpful either.

I know it probably isn't the end of the world (or the esp for that matter) but the less freaky warning the better, eh?

Anyone has got the same warning or has the vaguest idea what's wrong?

Go to Object Window.
Scroll down to All
Type "Where" in the filter box.
Anything comes up?

Two packages (ReindeerWalkWhereITellYou and TG06AicantarWaitElsewhere) which I haven't seen or touched.

Those wouldn't be it.
I got that error before, because I named something, and something happened when I named it.. I have since deleted the offending asset, but I just can't remember what it was. If it pops back in my mind, I'll come back and post

I think I found the problem. In the dialogue view of a quest I made I had created a topic (with the text "Where is your"), not given it a valid formid, tried to delete it, chosen no in the "do you really want to delete it"-warning, and then it just disappeared. Now when I opened it again (after a restart of the CK, I think that was the trigger) it was visible again in the dialogue tree, and I could remove it. I think that did the trick.

So in short, topics with invalid names that disappeared and then reappeared after a reboot of the CK.