Image not added via "add" link

Hello,

I've been administering a website for a few years now, and the combination of TinyMCE/IMCE has always worked fine in the standard way. Recently, though, the client reported that images she added were not showing up.

So I took a look, and was surprised to see she's right! The specifics:

1. The image uploads just fine through the IMCE browse method
2. Once the image is uploaded, you can see the "add" button as normal
3. When you click "add", it returns to the TinyMCE image dialog and shows the correct file path in the "Image URL" field
4. When you then click "Insert", you're returned to the node body. But the image appears as a ghostly outline (see attached screenshot).

When I then disable the rich-text editor, I see only this code:

<img alt="" width="250" height="250" /> 

So apparently during this last step the "img src" element is disappearing (or being stripped out). Note - the "Input format" is set to "Full HTML".

Then when I adjust the code to be correct, the image appears as normal. But the client is *not* HTML-friendly, and she will not want to do this when uploading images.

I've searched the other related issues, but didn't find an answer, and also didn't see my exact question. Any assistance will be much appreciated.

Jim