We have transitioned servers and have a new person running our WordPress. She installed a bunch on plug ins that we weren't previously using before. Before the transition, I could post an image and make it the featured image for the main page without any problems. Now, although it will allow me to upload an image and make it a featured image (so that it shows up on the featured image box on the bottom right corner), once I click publish to publish the article, the image gets deleted from the featured image box and does not show up on the main page. It doesn't do this every time...every few articles or so, the featured image will go through. Any ideas about what's causing this???