I've lost confidence in my ability to find my way through a story without mapping it out first.
I used to enjoy inventing characters and then trusting them to lead me through their stories. But now I've been burned by several of these characters, who have led me on convoluted journeys to dead ends.
Now I find I have to take over, and plan the stories out myself - from the first step to the final destination. And rather than invest too heavily in writing an unmapped story, I will only write whose ending I know and like.
The question I haven't yet been able to answer is, does this kind of cautious writing stifle creativity?