Unity Material Problems

When I am using Unity and have another application running, if I switch to the other application and switch back to Unity, sometimes if I have a material selected in Unity, it will reset the material to default with no texture, default color, and diffuse shader. I don't think I can fix this problem but will this be improved in the future versions of Unity? Also, if this is not the right place to post this, could you link me to the page to report errors?

There isn't a page; you report bugs by using the bug reporter application.