The boulders are surrounding Lake Haiyaha. Though it may take a bit of exploring to find the problems that you are looking for. To get there you need to go to the top of bear mountain road (its been two years or so, so my memory is a little rusty as to if the name of that road is accurate) and then hike all the way in. You'll get a map of the park when you enter, use that you find your way to Haiyaha. I do remember that you'll pass Nymph Lake on the trail in, as well as passing the fork to head to Emerald Lake. Hope some of this info helps,
-Drew
Chaos boulders in rocky mountain national park