I have a wiki library. I have a custom web part that by default is hidden. I add the web part to the page. It works.
Ok, that was fun, let’s remove it and get back to work.
I edit the page again to remove it. It’s not there. But it is. As in, I can see it doing it’s thing, but I can’t manipulate it in any way; can’t grab it by it’s chrome, can’t edit the properties, can’t even click it’s little context menu. So where is it? And more importantly, how do I get it off my page again?
Enter SharePoint Designer
If I open the page in Designer, I can find the wee fella.
So if I set the Hidden value to False, and save, I can now see my web part.
Now I can get to the web part properties, and instead of making it hidden (which I can’t actually do, because it’s disabled), I can set the Chrome to None, thus achieving the same result.
So there solves the mystery of the hidden web part that was visible.