I ran into this on a local install of MediaWiki. With the default setting (in
1.3.1 anyway) of $wgUseImageResize = false, including image options like this:
will not work. The problem is in makeImageLinkObj() in Skin.php: options are
not processed unless $wgUseImageResize == true, despite the fact that only the
thumb and __px options are related to image resizing.
The workaround is of course to set $wgUseImageResize = true in
LocalSettings.php, but it's not very intuitive that the way to enable image
alignment and framing is to set a resize flag.
OS: Windows XP