When inviting new members to a Group the text in the popup window is white against a white background so it's impossible to see. By selecting the text I can see it and the send invite button works.
Anita received the email invite but upon clicking it, after the group loaded a message was displayed for Anita that said the invite had expired and suggesting she rich out to group admin etc.
I had not pressed the 'Expire' button on her pending invite.
I pressed the re-send button and the new email was not delivered.