ABSOLUTELY BRILLIANT! I had already tried deactivating each plugin one by one, trying to isolate the issue. Frankly, I thought it was either the AdSense or Related Posts plugins but neither appeared to be the culprit. Then, I deleted the PowerPress plugin folder entirely in my file manager, cleared my cache and reinstalled the plugin but it still had no affect. This was driving me nuts!
Your solution worked perfectly. It just moves the player below Related posts and aligns the embed and download links, which is visually more appealing. I can't thank you enough.