I am absolutely new to Roku, having just installed it yesterday. In my explorations it does not appear when I am watching something to be able to stop the program, go get a sandwich, and restart when I return. So far the stream restarts at the beginning, after commercials again.
I do not know if this is a Roku issue, or if it is specific to the content provider (Crackle, Vudu, Hulu, etc.). This is such a basic feature I am sure it exists, but I have not been able to figure out how to interrupt the stream and then restart where I was.