"Insert Image Into Post" Problems

So basically, when I upload images, everything works fine, as the image is then viewable in Media, etc.

However, when I try to actually insert the image into the post, the whole pop-up box goes white, and no code is entered into the post (i work in HTML view).

is their either a fix or workaround? Like is there a plugin that will allow me to paste the URL of the image, and auto-add it or something. Images are crucial to my site and I need a fix ASAP.

Please help, I’m desperate ??