I experience the same situation with Mr. Yokozuna :
I have updated to the latest version CrypTool 2.1 (Stable Build 7356.1)
I am using the template AES Cipher (Text Input)
I am using the correct text in hex and also the correct key in hex also (I checked both having space as separator or not)
I am using ECB with padding PKS7
But the template fails to decrypt, as it displays the message
"Padding is invalid and cannot be removed"
When I am using the same template, without any padding, the plaintext starts with J but the rest is gibberish.
Can I send a PM with my findings to check my solution ?