I had the same problem last night. Go to content manager and click check for new items and give it a few minutes. Then go back to home page and wait a few seconds, this has worked for me in the past. Also as you mentioned turning WN off and back on. There should be a thread in Tips, Tricks and Troubleshooting on this also. Hope this helps, let us know. If all else fails you can do a reset but I wouldn't do that yet.
Linda
Linda