Inserted element not showing after .prepend() or .append()

Inserted element not showing after .prepend() or .append()

Hi,

I inserted a div into another div-container via .prepend() or .append(), it shows in Firefox Webdeveloper "Show generated source", so I know it's there and where it should be. But it doesn't show.
When I just output text information in the div, it get's displayed but without any css styling, as if newly inserted DOM elements doesn't get styled.

---
<div id="response">
      <div class="uploadedfile">
            I was here before and I got style.
      </div>
      <div class="uploadedfile">
            I got inserted via .append() and I have no style!
      </div>
</div>
---

I'm using the AjaxUpload plugin and call the code from the "onComplete" callback function.
Does anyone know what this might be?

Thanks,
Thomas