In V4.4.5 the thumbnail behaviour is perfect, I think that Paul4 said it well on our V5 forum so I’ll quote him.
I like automatic thumbnails of images in posts, but I see in this version to close a “clicked” image you have to move cursor to the image window and click an ‘X’, whereas in the previous version the image window was “on” your cursor and all it required was another click
I must say I much prefer the previous method of display, without the repositioned window and “greyed out” remainder, and certainly the method of opening/closing
So why the change? Any particular reason for it?