If you see a white avatar with a dotted line for an reviewer or owner, this means the user hasn’t completed their account activation in PageProof yet.
A non-registered reviewer will look like this in the workflow (take a look at the avatar for email@example.com):
Here are some actions to take:
Firstly, check that the email address is typed correctly – even the best of us can type too quickly and accidently add a typo.
If the email address is correct, send the reviewer a nudge by clicking the ... icon to the right of their email address. This will prompt them to reviewer the proof.
Note: on occasion the image of the avatar might be cached by your browser, it will change to a solid avatar after they register but you may need to refresh your browser.