in dev, how can I make assets/javascripts changes show up in browser (rails 3.2/chrome 21)

In Chrome, I turn off caching in the DevTools (it means you need to keep them running, I think.) There's probably an easier way to get to them, but once I have the DevTools up, I click on the little sprocket in the lower right corner and I can then configure the browser.

I don't know if this will fix your issue, but at least you can be sure it isn't browser caching that's the problem. Hope this helps….