"Locked" Examine Item Window

[Dadditude]

I recently started having a problem with my UI and I am hoping that someone out there has some idea as to what the cause may be and how to fix it.

I recently decided to do away with the letterbox area on my system in order to see more of the scenery. Since doing that, the first Examine Item window that I open is locked in place, unable to be moved in any direction. The "Move" cursor (with the 4-way arrows) never even comes up. This does not happen with other types of examine windows or the second and subsequent Examine Item window.

I do not know if this is a general UI problem, a problem with Nightfall, or a problem with depechenode's Advanced Examine Windows (which I use), so I am posting this question in all 3 places in the hopes that someone out there can help me figure it out.