Thanks for all your feedback.

I am puzzled here. In the Trombinoscope code, the only way to get no path in the src of the img tag is when there is an error coming from the creation of the image.

Although you get contact_thumb_trombinoscope_232_89.png, have you looked if this is an actual image? It may just be a blank canvas.
Can you check? Thank you.

Actually, if there was nothing in your image, you would get

and not an image tag.

So there must be some configuration issue I am not aware of or some other plugin that may interfere for the creation of the JHTML::_('image', ...) Joomla tag.

To make sure this is a Trombinoscope view issue or not, you can also try and create a module instance and a contact view in the component.
See if the images are created there or not.

I apologize for making you test all this, but this is the only way I can help you without access to your site.

I am thinking this has to be a configuration issue though since you are the only one so far with this problem.

Thanks for the feedback.

If there was any way I could access your admin console, that would be great.

The only possibility (I can see) to get in img src empty would come from the code JHTML::_('image', ...). This code returns an image tag with no source IF a file is not found.

Now I am wondering if you have any other extension that would override the Jooma class JHtml found in libraries/cms/html/html.php or that would override part of its content.