Problem with animation blending

Hi all,

For few hours I am trying to make my animations for my character right. I am using ThirdPersonController from Unity. I have modified it a little so that it would work with my character (skeleton). I have problem with blend trees. I have 5 animations in my blend tree: Idle, Walk01, WalkLeft, WalkRight, Run. I want to make blending between this animations. When I run the game my character is in Idle state (OK). But when it blends into Walk01 animation - walk animation lasts for only let's say 1 second and then it stops. I edited this animation to loop, but it doesn't help. I would like to have looping walking animation. Somebody knows what exactly can be a problem and how to fix this? Below I post print screen from my Unity.