Greg, with this server's new format, you can "Drag and Drop" an image without having to open any dialog box.
Simply go to your folder, select the image you wish to post, "left-click" and drag the image from the folder over to any spot on the text area and drop it.
Wait a moment for the data to transfer (it'll show up at the bottom of the text area) and then proceed (either add more images or add text and then post)
I'll mention that I do wish the images showed at fill size instead of the dang thumbnails, though...