[psyang]

Never mind. Right after I posted the below, I did a couple more tests and the ad came back incorrect. I'll keep testing when I have time.

Spoilered as it does't work.

Spoiler!

Ok, did a bit of testing this morning. Could you remove the whole setSafeFrameConfig change (so that we are back to the original), then instead, comment out the enableSingleRequest line so we get:

googletag.defineSlot('/130049501/LeaderboardROS', [[728, 90], [970, 90]], 'div-gpt-ad-1461011238474-0').addService(googletag.pubads());
googletag.defineSlot('/130049501/ROSScraper', [[120, 600]], 'div-gpt-ad-1461011238474-1').addService(googletag.pubads());
//googletag.pubads().enableSingleRequest();
googletag.pubads().collapseEmptyDivs();
googletag.enableServices();

I sort of hacked this line out in my testing environment, and so far I've gotten 20 page refreshes in a row with the ad in the correct spot.

As far as I can tell, the enableSingleRequest() call will retrieve all of the ads in a single call. By commenting out the line, the two ads come back in two separate calls. So in theory, this shouldn't change anything except, maybe, a small change in performance. But like I said, making this change has solved the issue for me so far.