In my last version of Ida, it used to autpropagate names of functions and parameters. With v5, it doesn't update references to the variable--I have to use the k key on every copy. And it doesn't add comments in the caller's code marking the stuff pushed onto the stack with the parameter names like it used to. Is there some option where I can turn that on?

Latest version of IDA works fine for me. You can try pressing 'Y' inside a function to make sure its parameter names are set.