All characters are fully tested (spanish, german, hebrew, arabic...) when using the embedHTML method. Please check that Tidy is installed and enabled on your server and try again; you need to use Tidy to import all characters correctly.
You can find a receipt in the cookbook about accents and other special characters:
If after install and enable Tidy, you still have issues, please send the most sample script that illustrate your issue (without external connections or database access) to contact[at]phpdocx.com and the dev team check it to find any mistake.
P.S. : we have changed your username to hide the email you wrote as username