For the first issue, this is a WordPress quirk. WP generates all the resized images (the “thumbnail” and “medium” ones) at the time you upload the images, using the sizes specified at that point in time. If you subsequently change the size of those presets in Settings/Media, the change will only impact images that are uploaded after the change has been saved. To retroactively apply it, you need to regenerate the image thumbnails. This plugin looks like it will do so, but I haven’t tried it.
For the second, I’m guessing that the large-sized images you’ve got in the slideshow have differing heights. Cycle needs to work inside a fixed-size container, so we use the height of the tallest image for this container – the side effect being that for all the images that aren’t the same height as the tallest one, there will be more space to make up the missing height. Does this sounds applicable?
Dan
First issue — OK, I understand. A bit quirky, though I can live with it. If I try the plugin, I’ll let you know.
Second issue — they are all the same to within a few pixels in both W & H. Each is a full-screen Grab on iMac. So that variation couldn’t even account for one line of white, let alone what you can now see in the post, where I changed to “large.”
I went through all 12 images again — there are, in fact, two different heights, which differ by the “depth” of the icon dock on the iMac. At most equivalent to a couple of lines of text on the Web page. So that still isn’t the answer. But I now realize that the non-centered nature of the Prev/Counter/Next may be a clue. Is there some sort of cumulative “wrapping” effect, perhaps due to the true size of the image actually being wider than the text of the post proper? Said differently, if I had a theme without a right-hand column, would this not be a problem? (I don’t feel like I’m saying that clearly, but maybe you know what I mean.)