Smooth painting isn't working now?

Hello, I’ve made textures for landscape editing before but now it just fills whole “block” while painting, instead of nice smooth brush like it was before!? I’ve tried making new material pack from scratch so I can build new terrain, here’s editor picture of it:

http://pokit.org/get/img/29cb15b2781c5488487af1b47110cf20.jpg

Tool strength and brush size don’t affect this behaviour. Here is picture what actually happens when I try to paint with an material (rock in this example):

http://pokit.org/get/img/0a0499d311b47cd75b755ff0c818a0fa.jpg

Here’s my painting options, in case you need it:

http://pokit.org/get/img/e13dde1cc76627ed42aa06a9773b2030.jpg

Thanks in advance for helping me out!