The mirepoixvegas.com site is okay and running on 2.6 with no issues (so far). All the images are kept at smugmug because of WordPress's ongoing image upload problems. This just makes it a lot easier for me, actually, because I'm able to keep my images in different galleries and display them as I want.
My vegaswineaux.com site, on the other hand, is still in the midst of a software malfunction. In spite of uploading new images in the images folder, checking the permissions, and completely replacing the header.php with a fresh copy, my header image and rss images still aren't displaying.
I "upgraded" to 2.6 with both sites, but had to downgrade back to 2.5.1 with vegaswineaux because I could not log in in order to post, and because the image display went crazy. So I'm back to 2.5.1 with that one, but I can't figure out why the images aren't displaying.
They're both the same theme that I customized for my needs. Revolution theme by Brian Gardner. http://www.revolutiontheme.com.
If you compare the basic Magazine theme with mine, you can see that I did a LOT of customizing and can understand why I'm so upset.