Changing the text colour in the CANDDi Capture settings wizard sometimes doesn't update the screen for "logged in" visitors properly.
We are working on a proper fix for this (but in the mean time please do the following):
1. Navigate to the CANDDi Capture settings: Settings > Capture settings
2. Select the advanced view
3. Find '.CQ-canddi .CQm-user-id'
(you may wish to search for this)
4. Change values to
'padding:10px; color: #FFFFFF;'