Personally, I don't consider white rice to be a safe starch because it's still a small seed but prefer tubers. Still, when in a bind I tend to prefer it and white potatoes to other compromises. It makes me wonder, if white rice, rice noodles, and rice crackers are considered safe starches then why would white rice bread as well? I haven't checked but I'm sure it exists (at least brown rice, far less preferable of course).
I'm with Melissa. White rice is white rice is white rice. There is no fat. There is basically zero protein content. Cooking does not damage its nutritional value. Grinding up white rice into a powder does not alter the content enough to need to discuss it.
I myself am cool with having white rice sometimes, but when it comes to bread, it depends on the other ingredients in it. If you don't consider white rice to be a safe starch because rice is a seed, then you've really answered your own question- white rice bread isn't a safe starch because it is a seed product.
So under the assumption that you consider white rice a safe starch (which I personally do, though not to excess), then white rice flour and any products that could be made with it (also assuming other ingredients were paleo) would be paleo as well. The problem with bread is overdoing it. I could easily see someone eating a couple pieces and taking in a enormous amount of starch in one sitting. Also, it'd probably be pretty tough to find a commercial brand that doesn't have any sort of non-Paleo adulterants. That said if you made you own bread and didn't go nuts, it'd be safe (in my opinion).