Is there a way to update the database with new height and width for each image? I've overwritten the image files with smaller images (don't ask). I could just start over but don't want to lose the image descriptions unless there's no other way.

You should be able to do this with the Refresh Metadata utility.

Thank you :-) Why on earth didn't I try that?!

Big thank-you for an absolutely great gallery - love everything about it (especially now I know what that button does - lol).