Duplicate IDs if email posted twice without being a link

If you post the same email address twice or more on the same page (i.e. in separate comments) and in neither of these is the email actually a link (i.e. its just text) then Invisimail uses the same HTML ID in both cases. This can lead to confusion within the browser and, in our case, removes the address from display.

If the email is actually a link, then Invisimail works correctly.