Maybe you could send us a problematic image? contact@esotericsoftware.com
If not it would help to see your spine.log
file:
Windows: <user home folder>\Spine\spine.log
Mac: <user home folder>/Library/Application Support/Spine/spine.log
Linux: <user home folder>/.spine/spine.log
Thanks for sending the files. They loaded OK for me. The log indicates that the memory to hold the decoded image could not be allocated. I've improved the log message.
The files are 2000x2000, which is large enough that you can see the green "loading" placeholder image while they are being decoded. I noticed they were being loaded multiple times while dragging in some cases (they flash green briefly), so that has been fixed. I also fixed when dragging multiple that the images aren't positioned correctly after loading until the mouse is moved.
I'm not sure the above will help you. I wonder what is causing Spine to use so much memory that more can't be allocated. If you are willing to send your Spine project file and all your images, I could find out. We'll keep your files confidential, but I understand if you are not comfortable doing this.