OK, so... Erm... WHICH characters are illegal, eBay??? O_o
Throw me a damned bone, will you?!
And why is there NO EDIT BUTTON!?
The message "Your message includes characters that are not allowed. Please edit your message." is unreasonably obfuscated and completely void of information. How is anyone supposed to respond reasonably to this???
(And I can't attach an image file because it's a PNG!? What is wrong with your company!?)