Art Slideshow app has been updated to version 1.4.2, with several fixes and new features!

New Features:
The program now detects sub-folders! You can expand or collapse these subfolders by pressing the little arrow icon next to the main folder, and all subfolders will be selected/deselected alongside the main folder.
The source folder can now be changed! You no longer have to use the /images/ folder, but can pick out any path you like!
The credit prefix can now be changed! If your files are named "image from X", no need to rename - just change the credit prefix from "by" to "from" and you're good to go!
Error notifications - if an image is missing or too big to load, you'll now get text saying what the issue is!

Bugs fixed:
Some .gifs playing incorrectly
The last folder being partially hidden depending on your window size
Images freezing in a partially transparent state if the next image is taking a long time to load