I've got this weird problem that I'm not able to figure out.
https://www.dropbox.com/s/3bfnbts781yme ... e.zip?dl=0
On frame 0 there is a blue color and I don't seem to be able to pinpoint where it is.

If I select the shape and deactivate the fill, it gives me this.

However, when I preview the animation, the blue color is not visible. But if I render a preview frame, it is.
If somebody has the time to check out the file and tell me what I've missed, I'd be happy!
Thanks!
Kari
EDIT: It has something to do with shape effects, when I disable it from the display quality, the blue layer disappears. It's somewhere in the cache, but I'm not able to clean it.