Tried out the new Gallery feature on my photoblog (Random Acts of Photography)and have run into a couple of problems.
First problem-"alt" tags: When I initially uploaded the photos using the Flash Uploader, I didn't include Captions for the photos because I didn't want them displayed on my thumbnail images. After reading that the text for Caption is what assigns the "alt" tag on images, I went back to the Media Library and entered the text in the line "Caption" where the instructions say, "Caption: 'Alternate text, e.g. "The Mona Lisa"'. That generated a Caption under the thumbnail image, but no "alt" tag appears either on the page where the thumbnail is displayed or on the page where the individual photo is displayed.
I then tried uploading a new Gallery to a test post and included the Caption to see if it generated the "alt" tag. It didn't.
Next problem-Image appears as "Post": after clicking on one of the Gallery thumbnails you are taken to what appears to be another Post page displaying the image. There is even a category assigned to that image Post, "uncategorized". However, if you click on that category link, you end up at a 404 Error page.
Commenting is also available on that individual image Post. There isn't a way to edit the Post, except as an image via the Media Library, or turn commenting off.
I'm not sure that these problems are something I can correct. It appears to be in the way the Gallery is set up.
Your work arounds and thoughts are welcome.