I cleared my current browser and tried both Firefox and Internet Explorer. The results are the same. It shows my ad entered twice since I did not get a confirmation of the first ad, but an error message instead so it's entered twice. It shows my ad in the Marketplace but not In Boats/Accessories. I cant seem to get it into the correct category and there is no way that I can see to manage my ads. I used to manage them in MyMarket on the old website format.
When you say "old website" what do you mean? Do you mean the version immediately prior to the update that happened on September 5th? I'm trying to get a sense of what you're referring to.
Also, what device is this happening to you on? I'd like to try and recreate the issues you're running into, so any information you can provide me with will be very much appreciated.