I had surgery on 3/12, and all my incisions are healed with the exception of a tiny opening in my main incision (on the end).I went to urgent care and they said it was not infected and they put some steristrips on it. The opening was only half of a cm, and yet, it refuses to heal! That was maybe 1-2 weeks ago. I've been keeping a bandaid on it as instructed. While there is still no sign of infection, there continues to be drainage.

Has this happened to anyone else? Will it ever heal?

That's so strange! I'm sure it will eventually close up. Since it's not infected, that's great. I'd show it to your doc at your next appt.