I am having several ongoing problems with painting detail meshes in unity. I am running version 4.1.2, and I am weary of updating, so unless you know that fixes the issues I'm about to list, please don't suggest it.

Problem 1: Some detail meshes wont paint. These are detail meshes I bought in the unity store- https://www.assetstore.unity3d.com/#/content/3136 so by all means they should work.

When I... Edit Details> Add Detail Mesh> select my mesh> color's desaturated greys, render mode vertexlit> add
it shows up in the box the way it should. I can select that mesh, and I have my paintbrush size and density set the way they should be (I have even experimented with different size and density combinations just to be sure). When I go to paint it.. there is nothing.
I have tried on different slopes. I have tried zooming way in to see if the are just not rendering from a distance. I have gone into play mode and run right over to where it should be, and there is nothing.
Certain detail meshes DO paint for me. I can paint the grass clumps, ferns, and things like that from this pack... but the rocks, stumps, logs, mushrooms, etc do not paint. I am also able to paint on the rocks from the standard asset pack, so if anyone has any ideas why this isn't working, please let me know.

Problem 2: The rocks that I can paint from the standard asset pack move in the wind like plants.

Seriously, they look like someone made a flag with a picture of a rock on it, stuck it in the ground, and its gently billowing in the breeze.
I have double checked that I have the render mode on vertexlit, I have removed any rigging and animation from the rock mesh... and still they do this.

I have a feeling that these two issues might be related, since the only detail meshes I can get unity to place are plants that move, and rocks..that move....

No clue what went wrong or how to fix this, and there is a sad lack of answers to this problem on the internet.
Thanks for taking the time to read this, and all help is appreciated!