Skins Missing Textures

I have been having issues with GUI Skins “forgetting” what textures they are referencing. I’m using Unity Pro and SVN to manage the project from team member to team member. All meta files have been committed. I never used to have this problem, but it’s been happening more and more since 3.4.1. Has anyone else found out why this is happening?

I don’t know if is this, but, when I open an Project of my flash-usb the skins of all my objects desapper, thats may be the problem of using SVN, try to copy the paste to your documents and open again.