Something was changed since the last update.
In the last version it was fine to end with akismet:author after the placeholder. I had to move akisment in front of the placeholder, that fixed it. I believe this could potentially become a problem with several websites.
DOES NOT WORK ANYMORE (worked in last version):
[text* text-415 class:register placeholder "Full Name" akismet:author]
[email email-897 class:register placeholder "Email Address" akismet:author_email]
WORKS:
[text* text-415 class:register akismet:author placeholder "Full Name"]
[email email-897 class:register akismet:author_email placeholder "Email Address"]