I have been using the popular NextGEN Gallery plugin on the web sites I am managing for quite some time with good success. Recently I upgraded one site with NextGEN FlashViewer, but found out that the free version can display a maximum of 50 images per gallery (otherwise it worked perfectly). Since some of my galleries have close to 200 images, I purchased Simple Viewer Pro 2.0.1, and replaced the free version of viewer.swf on my site with the one that comes with Simple Viewer Pro 2.0.1.
That solved my problem as far as the image limit per gallery goes, but the galleries seem centered without taking the Wordpress sidebar into account. Part of the thumbnails are covered by the sidebar, and the image at the top is scaled down almost to thumbnail size. See eg here
http://www.ohiocichlid.com/oca-extravaganza/extravaganza-2009-gallery/
If you try it out, you will note that the full screen view actually looks good. Also, if I use the viewer.swf file that comes with Simple Viewer Pro 1.9. (they send you that along with the newer version for reasons beyond my comprehension), the gallery view on a page is properly centered, but there is no full screen view with the 1.9 version. Unfortunately I need full screen view.
In wp-admin under Gallery/Flash Viewer/Simple Viewer, both vertical and horizontal align are center - and they are centered, just centered with respect to the entire page width, not the area left of the side bar!
I've described my problem in the Simpleviewer.net support forums and the Wordpress support forums without receiving any useful suggestions. Hopefully somebody here has an idea how I can fix this.
Many thanks
Frank