When I opened the options window, it was centered and unmovable on my screen. (Win 7 64bit, 1920x1080 laptop, current version 4)
I was going through the options, and wanted to move the default screenshot folder. I mistakenly chose one of "link" version of "My Pictures" instead of the actual My Pictures folder. That caused an error dialog to come up. I could see just a sliver of it's right edge under the main options window. Fortunately, I was able to click a piece of the "red X" and close it. It was also not movable, and of course, it doesn't show up as a separate window on the task bar, so there was no way I found to move it.