Trouble with viewing photos and scrolling

I'm encountering trouble with viewing photos and scrolling the timeline.

When DFly first opens, it provides a window which is quite narrow and tall. While that size is fine, in this configuration, when a photo is clicked on the width of the photo is limited by the width of the DFly window. This means that photos are displayed in such a small size that I can't see any details. They’re hardly bigger than the thumbnail. To actually view any level of detail in the photo, I have to dramatically expand the width of the DFly window.

Once this is done, I am able to view photos as I want to see them at their full size. However, this creates a new problem in that any time my cursor is not directly hovering over posts in the timeline, I am unable to scroll the timeline. Hovering my mouse to the left or right of the timeline removes my ability to scroll up and down.

I have further noticed that when scrolling the timeline, there is a scrollbar displayed on the right side showing me where I am in the timeline. Much of the time, the scrollbar cannot be selected. When the scrollbar can be selected, it behaves in an erratic manner.

Ideally, photos would display at a size which is not constrained by the size of the DFly window and should display at a size large enough to see fine details.

Here is a demonstration of these issues: