[ZacFields]

vbulletin 4.1.6 is the version I'm using and the Firefox version is the most current one as well.

I'm working on your recommendation of disabling mods but just wanted to check and see if this was something that was a known issue of a particular mod.

Here's the weirdest part of all this: If I get on Google Chrome and I upload an image to a thread (and can see that it works fine), I can hit view source and get the actual URL to that image and paste it in both Chrome and IE and it will show me the image. If I paste that URL into Firefox, it takes me to a page that says "Invalid Attachment specified. If you followed a valid link, please notify the administrator". For the same exact link!

I'll start peeling away mods but as you can see by my screenshot, I don't have any mods installed that aren't exactly "mainstream" mods. That's why I was hoping that someone would recognize this issue and know what the source problem is.

As a workaround for now, I've disabled thumbnails. Don't ask me why, but if the image is loaded full size into the thread it works just fine.